\(\int \frac {\sinh ^2(x)}{a \cosh ^2(x)+b \sinh ^2(x)} \, dx\) [838]

Optimal result

Integrand size = 20, antiderivative size = 39 \[ \int \frac {\sinh ^2(x)}{a \cosh ^2(x)+b \sinh ^2(x)} \, dx=\frac {x}{a+b}-\frac {\sqrt {a} \arctan \left (\frac {\sqrt {b} \tanh (x)}{\sqrt {a}}\right )}{\sqrt {b} (a+b)} \]

[Out]

x/(a+b)-arctan(b^(1/2)*tanh(x)/a^(1/2))*a^(1/2)/(a+b)/b^(1/2)

Rubi [A] (verified)

Time = 0.11 (sec) , antiderivative size = 39, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.150, Rules used = {492, 213, 211} \[ \int \frac {\sinh ^2(x)}{a \cosh ^2(x)+b \sinh ^2(x)} \, dx=\frac {x}{a+b}-\frac {\sqrt {a} \arctan \left (\frac {\sqrt {b} \tanh (x)}{\sqrt {a}}\right )}{\sqrt {b} (a+b)} \]

[In]

Int[Sinh[x]^2/(a*Cosh[x]^2 + b*Sinh[x]^2),x]

[Out]

x/(a + b) - (Sqrt[a]*ArcTan[(Sqrt[b]*Tanh[x])/Sqrt[a]])/(Sqrt[b]*(a + b))

Rule 211

Int[((a_) + (b_.)*(x_)^2)^(-1), x_Symbol] :> Simp[(Rt[a/b, 2]/a)*ArcTan[x/Rt[a/b, 2]], x] /; FreeQ[{a, b}, x]
&& PosQ[a/b]

Rule 213

Int[((a_) + (b_.)*(x_)^2)^(-1), x_Symbol] :> Simp[(-(Rt[-a, 2]*Rt[b, 2])^(-1))*ArcTanh[Rt[b, 2]*(x/Rt[-a, 2])]
, x] /; FreeQ[{a, b}, x] && NegQ[a/b] && (LtQ[a, 0] || GtQ[b, 0])

Rule 492

Int[((e_.)*(x_))^(m_.)/(((a_) + (b_.)*(x_)^(n_))*((c_) + (d_.)*(x_)^(n_))), x_Symbol] :> Dist[(-a)*(e^n/(b*c -
a*d)), Int[(e*x)^(m - n)/(a + b*x^n), x], x] + Dist[c*(e^n/(b*c - a*d)), Int[(e*x)^(m - n)/(c + d*x^n), x], x
] /; FreeQ[{a, b, c, d, e, m}, x] && NeQ[b*c - a*d, 0] && IGtQ[n, 0] && LeQ[n, m, 2*n - 1]

Rubi steps \begin{align*} \text {integral}& = -\text {Subst}\left (\int \frac {x^2}{\left (-1+x^2\right ) \left (a+b x^2\right )} \, dx,x,\tanh (x)\right ) \\ & = -\frac {\text {Subst}\left (\int \frac {1}{-1+x^2} \, dx,x,\tanh (x)\right )}{a+b}-\frac {a \text {Subst}\left (\int \frac {1}{a+b x^2} \, dx,x,\tanh (x)\right )}{a+b} \\ & = \frac {x}{a+b}-\frac {\sqrt {a} \arctan \left (\frac {\sqrt {b} \tanh (x)}{\sqrt {a}}\right )}{\sqrt {b} (a+b)} \\ \end{align*}

Mathematica [A] (verified)

Time = 0.31 (sec) , antiderivative size = 34, normalized size of antiderivative = 0.87 \[ \int \frac {\sinh ^2(x)}{a \cosh ^2(x)+b \sinh ^2(x)} \, dx=\frac {x-\frac {\sqrt {a} \arctan \left (\frac {\sqrt {b} \tanh (x)}{\sqrt {a}}\right )}{\sqrt {b}}}{a+b} \]

[In]

Integrate[Sinh[x]^2/(a*Cosh[x]^2 + b*Sinh[x]^2),x]

[Out]

(x - (Sqrt[a]*ArcTan[(Sqrt[b]*Tanh[x])/Sqrt[a]])/Sqrt[b])/(a + b)

Maple [B] (verified)

Leaf count of result is larger than twice the leaf count of optimal. \(91\) vs. \(2(31)=62\).

Time = 0.18 (sec) , antiderivative size = 92, normalized size of antiderivative = 2.36

method	result	size
risch	\(\frac {x}{a +b}+\frac {\sqrt {-a b}\, \ln \left ({\mathrm e}^{2 x}-\frac {-a +2 \sqrt {-a b}+b}{a +b}\right )}{2 b \left (a +b \right )}-\frac {\sqrt {-a b}\, \ln \left ({\mathrm e}^{2 x}+\frac {a +2 \sqrt {-a b}-b}{a +b}\right )}{2 b \left (a +b \right )}\)	\(92\)
default	\(\frac {8 a^{2} \left (-\frac {\left (-a +\sqrt {b \left (a +b \right )}-b \right ) \operatorname {arctanh}\left (\frac {a \tanh \left (\frac {x}{2}\right )}{\sqrt {\left (2 \sqrt {b \left (a +b \right )}-a -2 b \right ) a}}\right )}{2 a \sqrt {b \left (a +b \right )}\, \sqrt {\left (2 \sqrt {b \left (a +b \right )}-a -2 b \right ) a}}+\frac {\left (a +\sqrt {b \left (a +b \right )}+b \right ) \arctan \left (\frac {a \tanh \left (\frac {x}{2}\right )}{\sqrt {\left (2 \sqrt {b \left (a +b \right )}+a +2 b \right ) a}}\right )}{2 a \sqrt {b \left (a +b \right )}\, \sqrt {\left (2 \sqrt {b \left (a +b \right )}+a +2 b \right ) a}}\right )}{4 a +4 b}+\frac {8 \ln \left (1+\tanh \left (\frac {x}{2}\right )\right )}{8 a +8 b}-\frac {8 \ln \left (\tanh \left (\frac {x}{2}\right )-1\right )}{8 a +8 b}\)	\(191\)

[In]

int(sinh(x)^2/(a*cosh(x)^2+b*sinh(x)^2),x,method=_RETURNVERBOSE)

[Out]

x/(a+b)+1/2/b*(-a*b)^(1/2)/(a+b)*ln(exp(2*x)-(-a+2*(-a*b)^(1/2)+b)/(a+b))-1/2/b*(-a*b)^(1/2)/(a+b)*ln(exp(2*x)
+(a+2*(-a*b)^(1/2)-b)/(a+b))

Fricas [A] (verification not implemented)

none

Time = 0.30 (sec) , antiderivative size = 367, normalized size of antiderivative = 9.41 \[ \int \frac {\sinh ^2(x)}{a \cosh ^2(x)+b \sinh ^2(x)} \, dx=\left [\frac {\sqrt {-\frac {a}{b}} \log \left (\frac {{\left (a^{2} + 2 \, a b + b^{2}\right )} \cosh \left (x\right )^{4} + 4 \, {\left (a^{2} + 2 \, a b + b^{2}\right )} \cosh \left (x\right ) \sinh \left (x\right )^{3} + {\left (a^{2} + 2 \, a b + b^{2}\right )} \sinh \left (x\right )^{4} + 2 \, {\left (a^{2} - b^{2}\right )} \cosh \left (x\right )^{2} + 2 \, {\left (3 \, {\left (a^{2} + 2 \, a b + b^{2}\right )} \cosh \left (x\right )^{2} + a^{2} - b^{2}\right )} \sinh \left (x\right )^{2} + a^{2} - 6 \, a b + b^{2} + 4 \, {\left ({\left (a^{2} + 2 \, a b + b^{2}\right )} \cosh \left (x\right )^{3} + {\left (a^{2} - b^{2}\right )} \cosh \left (x\right )\right )} \sinh \left (x\right ) - 4 \, {\left ({\left (a b + b^{2}\right )} \cosh \left (x\right )^{2} + 2 \, {\left (a b + b^{2}\right )} \cosh \left (x\right ) \sinh \left (x\right ) + {\left (a b + b^{2}\right )} \sinh \left (x\right )^{2} + a b - b^{2}\right )} \sqrt {-\frac {a}{b}}}{{\left (a + b\right )} \cosh \left (x\right )^{4} + 4 \, {\left (a + b\right )} \cosh \left (x\right ) \sinh \left (x\right )^{3} + {\left (a + b\right )} \sinh \left (x\right )^{4} + 2 \, {\left (a - b\right )} \cosh \left (x\right )^{2} + 2 \, {\left (3 \, {\left (a + b\right )} \cosh \left (x\right )^{2} + a - b\right )} \sinh \left (x\right )^{2} + 4 \, {\left ({\left (a + b\right )} \cosh \left (x\right )^{3} + {\left (a - b\right )} \cosh \left (x\right )\right )} \sinh \left (x\right ) + a + b}\right ) + 2 \, x}{2 \, {\left (a + b\right )}}, -\frac {\sqrt {\frac {a}{b}} \arctan \left (\frac {{\left ({\left (a + b\right )} \cosh \left (x\right )^{2} + 2 \, {\left (a + b\right )} \cosh \left (x\right ) \sinh \left (x\right ) + {\left (a + b\right )} \sinh \left (x\right )^{2} + a - b\right )} \sqrt {\frac {a}{b}}}{2 \, a}\right ) - x}{a + b}\right ] \]

[In]

integrate(sinh(x)^2/(a*cosh(x)^2+b*sinh(x)^2),x, algorithm="fricas")

[Out]

[1/2*(sqrt(-a/b)*log(((a^2 + 2*a*b + b^2)*cosh(x)^4 + 4*(a^2 + 2*a*b + b^2)*cosh(x)*sinh(x)^3 + (a^2 + 2*a*b +
b^2)*sinh(x)^4 + 2*(a^2 - b^2)*cosh(x)^2 + 2*(3*(a^2 + 2*a*b + b^2)*cosh(x)^2 + a^2 - b^2)*sinh(x)^2 + a^2 -
6*a*b + b^2 + 4*((a^2 + 2*a*b + b^2)*cosh(x)^3 + (a^2 - b^2)*cosh(x))*sinh(x) - 4*((a*b + b^2)*cosh(x)^2 + 2*(
a*b + b^2)*cosh(x)*sinh(x) + (a*b + b^2)*sinh(x)^2 + a*b - b^2)*sqrt(-a/b))/((a + b)*cosh(x)^4 + 4*(a + b)*cos
h(x)*sinh(x)^3 + (a + b)*sinh(x)^4 + 2*(a - b)*cosh(x)^2 + 2*(3*(a + b)*cosh(x)^2 + a - b)*sinh(x)^2 + 4*((a +
b)*cosh(x)^3 + (a - b)*cosh(x))*sinh(x) + a + b)) + 2*x)/(a + b), -(sqrt(a/b)*arctan(1/2*((a + b)*cosh(x)^2 +
2*(a + b)*cosh(x)*sinh(x) + (a + b)*sinh(x)^2 + a - b)*sqrt(a/b)/a) - x)/(a + b)]

Sympy [B] (verification not implemented)

Leaf count of result is larger than twice the leaf count of optimal. 202 vs. \(2 (32) = 64\).

Time = 0.59 (sec) , antiderivative size = 202, normalized size of antiderivative = 5.18 \[ \int \frac {\sinh ^2(x)}{a \cosh ^2(x)+b \sinh ^2(x)} \, dx=\begin {cases} \tilde {\infty } x & \text {for}\: a = 0 \wedge b = 0 \\\frac {x}{b} & \text {for}\: a = 0 \\- \frac {x \sinh ^{2}{\left (x \right )}}{- 2 b \sinh ^{2}{\left (x \right )} + 2 b \cosh ^{2}{\left (x \right )}} + \frac {x \cosh ^{2}{\left (x \right )}}{- 2 b \sinh ^{2}{\left (x \right )} + 2 b \cosh ^{2}{\left (x \right )}} - \frac {\sinh {\left (x \right )} \cosh {\left (x \right )}}{- 2 b \sinh ^{2}{\left (x \right )} + 2 b \cosh ^{2}{\left (x \right )}} & \text {for}\: a = - b \\\frac {x - \frac {\sinh {\left (x \right )}}{\cosh {\left (x \right )}}}{a} & \text {for}\: b = 0 \\\frac {2 x \sqrt {- \frac {b}{a}}}{2 a \sqrt {- \frac {b}{a}} + 2 b \sqrt {- \frac {b}{a}}} + \frac {\log {\left (- \sqrt {- \frac {b}{a}} \sinh {\left (x \right )} + \cosh {\left (x \right )} \right )}}{2 a \sqrt {- \frac {b}{a}} + 2 b \sqrt {- \frac {b}{a}}} - \frac {\log {\left (\sqrt {- \frac {b}{a}} \sinh {\left (x \right )} + \cosh {\left (x \right )} \right )}}{2 a \sqrt {- \frac {b}{a}} + 2 b \sqrt {- \frac {b}{a}}} & \text {otherwise} \end {cases} \]

[In]

integrate(sinh(x)**2/(a*cosh(x)**2+b*sinh(x)**2),x)

[Out]

Piecewise((zoo*x, Eq(a, 0) & Eq(b, 0)), (x/b, Eq(a, 0)), (-x*sinh(x)**2/(-2*b*sinh(x)**2 + 2*b*cosh(x)**2) + x
*cosh(x)**2/(-2*b*sinh(x)**2 + 2*b*cosh(x)**2) - sinh(x)*cosh(x)/(-2*b*sinh(x)**2 + 2*b*cosh(x)**2), Eq(a, -b)
), ((x - sinh(x)/cosh(x))/a, Eq(b, 0)), (2*x*sqrt(-b/a)/(2*a*sqrt(-b/a) + 2*b*sqrt(-b/a)) + log(-sqrt(-b/a)*si
nh(x) + cosh(x))/(2*a*sqrt(-b/a) + 2*b*sqrt(-b/a)) - log(sqrt(-b/a)*sinh(x) + cosh(x))/(2*a*sqrt(-b/a) + 2*b*s
qrt(-b/a)), True))

Maxima [B] (verification not implemented)

Leaf count of result is larger than twice the leaf count of optimal. 74 vs. \(2 (31) = 62\).

Time = 0.30 (sec) , antiderivative size = 74, normalized size of antiderivative = 1.90 \[ \int \frac {\sinh ^2(x)}{a \cosh ^2(x)+b \sinh ^2(x)} \, dx=-\frac {{\left (a - b\right )} \arctan \left (\frac {{\left (a + b\right )} e^{\left (2 \, x\right )} + a - b}{2 \, \sqrt {a b}}\right )}{2 \, \sqrt {a b} {\left (a + b\right )}} + \frac {\arctan \left (\frac {{\left (a + b\right )} e^{\left (-2 \, x\right )} + a - b}{2 \, \sqrt {a b}}\right )}{2 \, \sqrt {a b}} + \frac {x}{a + b} \]

[In]

integrate(sinh(x)^2/(a*cosh(x)^2+b*sinh(x)^2),x, algorithm="maxima")

[Out]

-1/2*(a - b)*arctan(1/2*((a + b)*e^(2*x) + a - b)/sqrt(a*b))/(sqrt(a*b)*(a + b)) + 1/2*arctan(1/2*((a + b)*e^(
-2*x) + a - b)/sqrt(a*b))/sqrt(a*b) + x/(a + b)

Giac [A] (verification not implemented)

none

Time = 0.27 (sec) , antiderivative size = 46, normalized size of antiderivative = 1.18 \[ \int \frac {\sinh ^2(x)}{a \cosh ^2(x)+b \sinh ^2(x)} \, dx=-\frac {a \arctan \left (\frac {a e^{\left (2 \, x\right )} + b e^{\left (2 \, x\right )} + a - b}{2 \, \sqrt {a b}}\right )}{\sqrt {a b} {\left (a + b\right )}} + \frac {x}{a + b} \]

[In]

integrate(sinh(x)^2/(a*cosh(x)^2+b*sinh(x)^2),x, algorithm="giac")

[Out]

-a*arctan(1/2*(a*e^(2*x) + b*e^(2*x) + a - b)/sqrt(a*b))/(sqrt(a*b)*(a + b)) + x/(a + b)

Mupad [B] (verification not implemented)

Time = 2.91 (sec) , antiderivative size = 209, normalized size of antiderivative = 5.36 \[ \int \frac {\sinh ^2(x)}{a \cosh ^2(x)+b \sinh ^2(x)} \, dx=\frac {x}{a+b}-\frac {\sqrt {a}\,\mathrm {atan}\left (\frac {\left ({\mathrm {e}}^{2\,x}\,\left (\frac {4\,a}{{\left (a+b\right )}^4}+\frac {\left (a^2-b^2\right )\,\left (a-b\right )}{{\left (a+b\right )}^3\,\sqrt {b\,{\left (a+b\right )}^2}\,\sqrt {a^2\,b+2\,a\,b^2+b^3}}\right )+\frac {\left (a-b\right )\,\left (a^2+2\,a\,b+b^2\right )}{{\left (a+b\right )}^3\,\sqrt {b\,{\left (a+b\right )}^2}\,\sqrt {a^2\,b+2\,a\,b^2+b^3}}\right )\,\left (a^2\,\sqrt {a^2\,b+2\,a\,b^2+b^3}+b^2\,\sqrt {a^2\,b+2\,a\,b^2+b^3}+2\,a\,b\,\sqrt {a^2\,b+2\,a\,b^2+b^3}\right )}{2\,\sqrt {a}}\right )}{\sqrt {a^2\,b+2\,a\,b^2+b^3}} \]

[In]

int(sinh(x)^2/(b*sinh(x)^2 + a*cosh(x)^2),x)

[Out]

x/(a + b) - (a^(1/2)*atan(((exp(2*x)*((4*a)/(a + b)^4 + ((a^2 - b^2)*(a - b))/((a + b)^3*(b*(a + b)^2)^(1/2)*(
2*a*b^2 + a^2*b + b^3)^(1/2))) + ((a - b)*(2*a*b + a^2 + b^2))/((a + b)^3*(b*(a + b)^2)^(1/2)*(2*a*b^2 + a^2*b
+ b^3)^(1/2)))*(a^2*(2*a*b^2 + a^2*b + b^3)^(1/2) + b^2*(2*a*b^2 + a^2*b + b^3)^(1/2) + 2*a*b*(2*a*b^2 + a^2*
b + b^3)^(1/2)))/(2*a^(1/2))))/(2*a*b^2 + a^2*b + b^3)^(1/2)