$x^6-2x^3-3$
$\frac{7\sec\left(x\right)}{\csc\left(x\right)}$
$\int k\:f\left(x\right)\:dx$
$\frac{4x+2}{x+2}$
$\lim_{n\to\infty}\left(n^3e^{-2n}\right)$
$-2x-3x^2-5=-1$
$\left(5ax^4-9y^5\right)^2$
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