$\left(3x\:2x\:4x\:7\right)$
$2y+9-y+3$
$\frac{dr}{d\theta\:}+rtan\theta\:=8sec\left(\theta\:\right)$
$2n^2+2nx-4n$
$cos\left(sin^{-1}\frac{x}{\sqrt{16+x^2}}\right)$
$2x-y-x$
$\frac{2x^4-x^2+2x-5}{x^2-2}$
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