$1+\csc^2\left(x\right)\tan^2\left(x\right)=2+\tan^2\left(x\right)$
$\frac{dy}{dx}=2x^2+2y$
$\int\left(\frac{z}{\left(z^2+1\right)^3}\right)dz$
$4x^6-4x$
$\frac{dy}{dx}=\frac{4y-3x}{2x-x}$
$16-25x^2$
$\left(7x-y\right)\left(7x+y\right)$
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