$\left(x+1\right)\sqrt{x^2+1}=y$
$2cos4xcos2x$
$-2x\cdot4$
$\frac{1}{\left(1+\sin\left(x\right)\right)\left(1-\sin\left(x\right)\right)}=\frac{8}{3}$
$\int\left(7w+w^2+w^3\right)dw$
$\frac{\csc^2a}{1+\tan a}$
$y^2-ay$
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