$1-\cos=\frac{\sin\left(x\right)}{\csc\left(x\right)+\cot\left(x\right)}$
$\left(ab^2-2b\right)^3$
$\left(2x-5\right)\left(2x-1\right)^4$
$\frac{-4x}{9x^2-9}$
$\int\left(x^8\left(x^9-13\right)^3\right)dx$
$\lim_{x\to2}\left(\frac{1-\sqrt{x+1}}{x-2}\right)$
$-15-28+2-80+50+-15+5$
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