$-b^2+2b$
$\csc^2x+3\cot^2x-5$
$\left(1+\cot\left(x\right)\right)^2$
$2x+6-zx-3z$
$x^5-3x^{3\:}$
$\int x^4\sqrt{16-x^2}dx$
$4\cot\left(x\right)^4y-20cot\left(x\right)^2y+25$
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