$\frac{x}{x-4}+\frac{4}{4-x}$
$\sec^2x+\csc^2x=\frac{\csc^2\left(x\right)}{\cos^2\left(x\right)}$
$\left(a-s\right)\left(a+t\right)$
$4+sin^2x$
$dy-cy-kdx$
$\int_{-2\pi}^{-\frac{5\pi}{2}}5\:cos\left(x\right)dx$
$33\left(0\right)+8$
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