$$ \int \cos ^{-1}\left(\frac{1-x^2}{1+x^2}\right) d x= $$
$2\left[x \tan ^{-1} x-\log \sqrt{1+x^2}\right]+C$
$2 x \tan ^{-1} x+\log \sqrt{1+x^2}+C$
$x \tan ^{-1} x+\log \sqrt{1-x^2}+C$
$2\left[\tan ^{-1} x-\log \sqrt{1+x^2}\right]+C$
$$ \int_0^x \frac{t^2}{\sqrt{a^2+t^2}} d t= $$
$\frac{x}{2} \sqrt{a^2+x^2}+\log \left|x+\sqrt{a^2+x^2}\right|$
$\sqrt{a^2+x^2}-a^2 \sinh ^{-1} \frac{x}{a}$
$\frac{x}{2} \sqrt{a^2+x^2}+\frac{a^2}{4} \log \left|x+\sqrt{a^2+x^2}\right|$
$\frac{x}{2} \sqrt{a^2+x^2}-\frac{a^2}{2} \sinh ^{-1} \frac{x}{a}$
$2(\sqrt{2}-1)$
$2(\sqrt{2}+1)$
$2(\sqrt{3}-1)$
$3 \sqrt{2}+1$
$$ \int_{\frac{5}{6}}^\pi \cos ^{-4} x d x= $$
$\frac{64}{9 \sqrt{3}}$
$\frac{52 \sqrt{3}}{9}$
$\frac{62 \sqrt{3}}{9}$
$\frac{44}{9 \sqrt{3}}$
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