$\int x^2\cdot e^{9x}\:dx$
$\cos\left(y\right)\frac{dy}{dt}=\frac{-t\sin\left(y\right)}{1+t^2}$
$2\tan^2\left(b\right)-\sec^2\left(b\right)=0$
$3y+6-4y$
$\cos^{4}\frac{x-\sen^{4}x+1}{\cos^{2}x}$
$-23+28-183$
$\frac{tan^2x-sin^2x}{sin^2x}+1=\frac{1}{cos^2x}$
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