$-2<x$
$x^2-2xy+yx-2y^2$
$\left(3x=7b\right)^2$
$\csc^2\left(x\right)+\csc^2\left(x\right)\cot^2\left(x\right)=csc^4\left(x\right)$
$\frac{d^2}{dx^2}\left(\frac{\ln\left(4x\right)}{x^4}\right)$
$\int\frac{x^2-2x+8}{x\sqrt{x-4}}dx$
$4x-\frac{3}{4}x$
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