If $\int \frac{\cos ^3 x}{\sin ^2 x+\sin ^4 x} d x=c-\operatorname{cosec} x-f(x)$, then $f\left(\frac{\pi}{2}\right)=$
1
0
$\pi / 2$
$\pi$
$$ \int \frac{13 \cos 2 x-9 \sin 2 x}{3 \cos 2 x-4 \sin 2 x} d x= $$
$3 x-\frac{1}{2} \log |3 \cos 2 x-4 \sin 2 x|+C$
$\frac{x}{2}-3 \log |3 \cos 2 x-4 \sin 2 x|+C$
$3 x+\frac{1}{2} \log |3 \cos 2 x-4 \sin 2 x|+C$
$x+\frac{3}{2} \log |3 \cos 2 x-4 \sin 2 x|+C$
$$ \int \sqrt{x^2+x+1} d x $$
$\frac{(2 x+1)}{4} \sqrt{x^2+x+1}+\frac{3}{8} \sinh ^{-1}\left(\frac{2 x+1}{\sqrt{3}}\right)+C$
$\frac{x+1}{4} \sqrt{x^2+x+1}+\frac{3}{8} \sinh ^{-1}\left(\frac{2 x+1}{\sqrt{3}}\right)+C$
$\frac{x+1}{4} \sqrt{x^2+x+1}-\frac{3}{8} \sinh ^{-1}\left(\frac{2 x+1}{\sqrt{3}}\right)+C$
$\frac{(2 x+1)}{4} \sqrt{x^2+x+1}-\frac{3}{8} \sinh ^{-1}\left(\frac{2 x+1}{\sqrt{3}}\right)+C$
If $k \in N$, then $\lim\limits_{n \rightarrow \infty}\left[\frac{1}{n+1}+\frac{1}{n+2}+\frac{1}{n+3}+\ldots .+\frac{1}{k n}\right]=$
$\log (k+1)$
$\log k$
$\log (k+5)$
$\log (k+1)-\log 6$
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