3.2.79 \(\int \frac {1}{(1+x) (2+x)} \, dx\) [179]

Optimal. Leaf size=11 \[ \log (1+x)-\log (2+x) \]

[Out]

ln(1+x)-ln(2+x)

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Rubi [A]
time = 0.00, antiderivative size = 11, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, integrand size = 11, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.182, Rules used = {36, 31} \begin {gather*} \log (x+1)-\log (x+2) \end {gather*}

Antiderivative was successfully verified.

[In]

Int[1/((1 + x)*(2 + x)),x]

[Out]

Log[1 + x] - Log[2 + x]

Rule 31

Int[((a_) + (b_.)*(x_))^(-1), x_Symbol] :> Simp[Log[RemoveContent[a + b*x, x]]/b, x] /; FreeQ[{a, b}, x]

Rule 36

Int[1/(((a_.) + (b_.)*(x_))*((c_.) + (d_.)*(x_))), x_Symbol] :> Dist[b/(b*c - a*d), Int[1/(a + b*x), x], x] -
Dist[d/(b*c - a*d), Int[1/(c + d*x), x], x] /; FreeQ[{a, b, c, d}, x] && NeQ[b*c - a*d, 0]

Rubi steps

\begin {align*} \int \frac {1}{(1+x) (2+x)} \, dx &=\int \frac {1}{1+x} \, dx-\int \frac {1}{2+x} \, dx\\ &=\log (1+x)-\log (2+x)\\ \end {align*}

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Mathematica [A]
time = 0.00, size = 11, normalized size = 1.00 \begin {gather*} \log (1+x)-\log (2+x) \end {gather*}

Antiderivative was successfully verified.

[In]

Integrate[1/((1 + x)*(2 + x)),x]

[Out]

Log[1 + x] - Log[2 + x]

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Maple [A]
time = 0.04, size = 12, normalized size = 1.09

method	result	size
default	\(\ln \left (1+x \right )-\ln \left (2+x \right )\)	\(12\)
norman	\(\ln \left (1+x \right )-\ln \left (2+x \right )\)	\(12\)
risch	\(\ln \left (1+x \right )-\ln \left (2+x \right )\)	\(12\)

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(1/(1+x)/(2+x),x,method=_RETURNVERBOSE)

[Out]

ln(1+x)-ln(2+x)

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Maxima [A]
time = 2.15, size = 11, normalized size = 1.00 \begin {gather*} -\log \left (x + 2\right ) + \log \left (x + 1\right ) \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(1+x)/(2+x),x, algorithm="maxima")

[Out]

-log(x + 2) + log(x + 1)

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Fricas [A]
time = 0.50, size = 11, normalized size = 1.00 \begin {gather*} -\log \left (x + 2\right ) + \log \left (x + 1\right ) \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(1+x)/(2+x),x, algorithm="fricas")

[Out]

-log(x + 2) + log(x + 1)

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Sympy [A]
time = 0.03, size = 8, normalized size = 0.73 \begin {gather*} \log {\left (x + 1 \right )} - \log {\left (x + 2 \right )} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(1+x)/(2+x),x)

[Out]

log(x + 1) - log(x + 2)

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Giac [A]
time = 0.44, size = 13, normalized size = 1.18 \begin {gather*} -\log \left ({\left | x + 2 \right |}\right ) + \log \left ({\left | x + 1 \right |}\right ) \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(1+x)/(2+x),x, algorithm="giac")

[Out]

-log(abs(x + 2)) + log(abs(x + 1))

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Mupad [B]
time = 0.07, size = 10, normalized size = 0.91 \begin {gather*} \ln \left (1-\frac {1}{x+2}\right ) \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(1/((x + 1)*(x + 2)),x)

[Out]

log(1 - 1/(x + 2))

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