3.5.76 \(\int \frac {2^{2 x}}{a-2^x b} \, dx\) [476]

Optimal. Leaf size=32 \[ -\frac {2^x}{b \log (2)}-\frac {a \log \left (a-2^x b\right )}{b^2 \log (2)} \]

[Out]

-2^x/b/ln(2)-a*ln(a-2^x*b)/b^2/ln(2)

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Rubi [A]
time = 0.03, antiderivative size = 32, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, integrand size = 16, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.125, Rules used = {2280, 45} \begin {gather*} -\frac {a \log \left (a-b 2^x\right )}{b^2 \log (2)}-\frac {2^x}{b \log (2)} \end {gather*}

Antiderivative was successfully verified.

[In]

Int[2^(2*x)/(a - 2^x*b),x]

[Out]

-(2^x/(b*Log[2])) - (a*Log[a - 2^x*b])/(b^2*Log[2])

Rule 45

Int[((a_.) + (b_.)*(x_))^(m_.)*((c_.) + (d_.)*(x_))^(n_.), x_Symbol] :> Int[ExpandIntegrand[(a + b*x)^m*(c + d
*x)^n, x], x] /; FreeQ[{a, b, c, d, n}, x] && NeQ[b*c - a*d, 0] && IGtQ[m, 0] && ( !IntegerQ[n] || (EqQ[c, 0]
&& LeQ[7*m + 4*n + 4, 0]) || LtQ[9*m + 5*(n + 1), 0] || GtQ[m + n + 2, 0])

Rule 2280

Int[((a_) + (b_.)*(F_)^((e_.)*((c_.) + (d_.)*(x_))))^(p_.)*(G_)^((h_.)*((f_.) + (g_.)*(x_))), x_Symbol] :> Wit
h[{m = FullSimplify[g*h*(Log[G]/(d*e*Log[F]))]}, Dist[Denominator[m]*(G^(f*h - c*g*(h/d))/(d*e*Log[F])), Subst
[Int[x^(Numerator[m] - 1)*(a + b*x^Denominator[m])^p, x], x, F^(e*((c + d*x)/Denominator[m]))], x] /; LeQ[m, -
1] || GeQ[m, 1]] /; FreeQ[{F, G, a, b, c, d, e, f, g, h, p}, x]

Rubi steps

\begin {align*} \int \frac {2^{2 x}}{a-2^x b} \, dx &=\frac {\text {Subst}\left (\int \frac {x}{a-b x} \, dx,x,2^x\right )}{\log (2)}\\ &=\frac {\text {Subst}\left (\int \left (-\frac {1}{b}-\frac {a}{b (-a+b x)}\right ) \, dx,x,2^x\right )}{\log (2)}\\ &=-\frac {2^x}{b \log (2)}-\frac {a \log \left (a-2^x b\right )}{b^2 \log (2)}\\ \end {align*}

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Mathematica [A]
time = 0.01, size = 26, normalized size = 0.81 \begin {gather*} -\frac {2^x b+a \log \left (a-2^x b\right )}{b^2 \log (2)} \end {gather*}

Antiderivative was successfully verified.

[In]

Integrate[2^(2*x)/(a - 2^x*b),x]

[Out]

-((2^x*b + a*Log[a - 2^x*b])/(b^2*Log[2]))

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Maple [A]
time = 0.01, size = 35, normalized size = 1.09

method	result	size
risch	\(-\frac {2^{x}}{b \ln \left (2\right )}-\frac {a \ln \left (2^{x}-\frac {a}{b}\right )}{\ln \left (2\right ) b^{2}}\)	\(35\)
norman	\(-\frac {{\mathrm e}^{x \ln \left (2\right )}}{\ln \left (2\right ) b}-\frac {a \ln \left (a -{\mathrm e}^{x \ln \left (2\right )} b \right )}{\ln \left (2\right ) b^{2}}\)	\(37\)

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(2^(2*x)/(a-2^x*b),x,method=_RETURNVERBOSE)

[Out]

-2^x/b/ln(2)-a/ln(2)/b^2*ln(2^x-a/b)

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Maxima [A]
time = 0.29, size = 33, normalized size = 1.03 \begin {gather*} -\frac {2^{x}}{b \log \left (2\right )} - \frac {a \log \left (2^{x} b - a\right )}{b^{2} \log \left (2\right )} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(2^(2*x)/(a-2^x*b),x, algorithm="maxima")

[Out]

-2^x/(b*log(2)) - a*log(2^x*b - a)/(b^2*log(2))

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Fricas [A]
time = 0.37, size = 27, normalized size = 0.84 \begin {gather*} -\frac {2^{x} b + a \log \left (2^{x} b - a\right )}{b^{2} \log \left (2\right )} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(2^(2*x)/(a-2^x*b),x, algorithm="fricas")

[Out]

-(2^x*b + a*log(2^x*b - a))/(b^2*log(2))

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Sympy [A]
time = 0.07, size = 34, normalized size = 1.06 \begin {gather*} - \frac {a \log {\left (2^{x} - \frac {a}{b} \right )}}{b^{2} \log {\left (2 \right )}} + \begin {cases} - \frac {2^{x}}{b \log {\left (2 \right )}} & \text {for}\: b \log {\left (2 \right )} \neq 0 \\- \frac {x}{b} & \text {otherwise} \end {cases} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(2**(2*x)/(a-2**x*b),x)

[Out]

-a*log(2**x - a/b)/(b**2*log(2)) + Piecewise((-2**x/(b*log(2)), Ne(b*log(2), 0)), (-x/b, True))

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Giac [A]
time = 1.94, size = 34, normalized size = 1.06 \begin {gather*} -\frac {2^{x}}{b \log \left (2\right )} - \frac {a \log \left ({\left | 2^{x} b - a \right |}\right )}{b^{2} \log \left (2\right )} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(2^(2*x)/(a-2^x*b),x, algorithm="giac")

[Out]

-2^x/(b*log(2)) - a*log(abs(2^x*b - a))/(b^2*log(2))

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Mupad [B]
time = 3.58, size = 27, normalized size = 0.84 \begin {gather*} -\frac {2^x\,b+a\,\ln \left (2^x\,b-a\right )}{b^2\,\ln \left (2\right )} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(2^(2*x)/(a - 2^x*b),x)

[Out]

-(2^x*b + a*log(2^x*b - a))/(b^2*log(2))

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