## Problem Statement

Calculate the indefinite integral:

$$
\int \frac{x+\cos x}{x^{2}+2 \sin x} d x
$$
## Solution

$$
\begin{aligned}
& \int \frac{x+\cos x}{x^{2}+2 \sin x} d x=\int \frac{\frac{1}{2}(2 x+2 \cos x)}{x^{2}+2 \sin x} d x=\frac{1}{2} \cdot \int \frac{d\left(x^{2}+2 \sin x\right)}{x^{2}+2 \sin x}= \\
& =\frac{1}{2} \cdot \ln \left|x^{2}+2 \sin x\right|+C
\end{aligned}
$$

Source — "http://pluspi.org/wiki/index.php/\�\�\�\�\�\�\�\�\�\�\�\� \%D0\%9A\%D1\%83\%D0\%B7\%D0\%BD\%D0\%B5\%D1\%86\%D0\%BE\%D0\%B2_\%D0\%98\%D0\%BD $\% \mathrm{D} 1 \% 82 \% \mathrm{D} 0 \% \mathrm{~B} 5 \% \mathrm{D} 0 \% \mathrm{~B} 3 \% \mathrm{D} 1 \% 80 \% \mathrm{D} 0 \% \mathrm{~B} 0 \% \mathrm{D} 0 \% \mathrm{BB} \% \mathrm{D} 1 \% 8 \mathrm{~B} 3-20$ "

Categories: Kuznetsov's Problem Book Integrals Problem 3 | Integrals

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## Problem Kuznetsov Integrals 3-21

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