$$ \int \frac{d x}{(1+\sqrt{x}) \sqrt{x-x^2}}= $$
$-2 \sqrt{\frac{1+\sqrt{x}}{1-\sqrt{x}}}+C$
$-\sqrt{\frac{1-\sqrt{x}}{1+\sqrt{x}}}+C$
$-2 \sqrt{\frac{1-\sqrt{x}}{1+\sqrt{x}}}+C$
$2 \sqrt{\frac{1+\sqrt{x}}{1-\sqrt{x}}}+C$
$$ \int \sin ^{-1}\left(\sqrt{\frac{x}{a+x}}\right) d x= $$
$(a+x) \tan ^{-1} \sqrt{\frac{x}{a}}+a x+C$
$(a+x) \tan ^{-1} \sqrt{\frac{x}{a}}+\sqrt{a x}+C$
$(a+x) \tan ^{-1} \sqrt{\frac{a}{x}}-\sqrt{a x}+C$
$(a+x) \tan ^{-1} \sqrt{\frac{x}{a}}-\sqrt{a x}+C$
If $\int \frac{x}{x \tan x+1} d x=\log f(x)+k$, then $f\left(\frac{\pi}{4}\right)=$
$\frac{\pi}{4 \sqrt{2}}$
$\pi+\frac{\pi}{2 \sqrt{2}}$
$\frac{\pi+4}{4 \sqrt{2}}$
$\frac{\pi-4}{4 \sqrt{2}}$
$$ \int_0^1 \frac{2 x+5}{x^2+3 x+2} d x= $$
$\log \left(\frac{16}{3}\right)$
0
$\log \left(\frac{3}{16}\right)$
$4 \log 2-2 \log 3$
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