$$ \int \frac{1}{\cos x}\left[\frac{1}{\sin x}-\frac{1}{\sin x+3 \cos x}\right] d x= $$
$\frac{1}{3} \log \left|\frac{\sin x}{\sin x+3 \cos x}\right|+C$
$\log \left|\frac{\cos x}{\sin x+3 \cos x}\right|+c$
$\frac{1}{3} \log \left|\frac{\cos x}{\sin x+3 \cos x}\right|+C$
$\log \left|\frac{\sin x}{\sin x+3 \cos x}\right|+c$
$$ \int \cos ^{-1}\left(\frac{1-x^2}{1+x^2}\right) d x= $$
$2\left[x \tan ^{-1} x-\log \sqrt{1+x^2}\right]+C$
$2 x \tan ^{-1} x+\log \sqrt{1+x^2}+C$
$x \tan ^{-1} x+\log \sqrt{1-x^2}+C$
$2\left[\tan ^{-1} x-\log \sqrt{1+x^2}\right]+C$
$$ \int_0^x \frac{t^2}{\sqrt{a^2+t^2}} d t= $$
$\frac{x}{2} \sqrt{a^2+x^2}+\log \left|x+\sqrt{a^2+x^2}\right|$
$\sqrt{a^2+x^2}-a^2 \sinh ^{-1} \frac{x}{a}$
$\frac{x}{2} \sqrt{a^2+x^2}+\frac{a^2}{4} \log \left|x+\sqrt{a^2+x^2}\right|$
$\frac{x}{2} \sqrt{a^2+x^2}-\frac{a^2}{2} \sinh ^{-1} \frac{x}{a}$
$2(\sqrt{2}-1)$
$2(\sqrt{2}+1)$
$2(\sqrt{3}-1)$
$3 \sqrt{2}+1$
AP EAPCET Papers
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