$\frac{\tan\left(a\right)^2}{1+\tan\left(a\right)^2}-\sin\left(a\right)^2$
$\frac{x+4}{2x}=\frac{2}{3}$
$35\:x\frac{2}{7}$
$2+2\sqrt{2xy}+2y$
$\frac{dy}{dx}+\:y\:sinx\:=4\sin\left(x\right)$
$-1029-65-12-28$
$\frac{du}{dy}+2u=e^y$
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