$3\left(a+b\right)c^2$
$\frac{0,3x^5}{x^2}$
$\frac{1}{\cot\left(a\right)}=\sin\left(a\right)\sec\left(a\right)$
$2x^4+3x^3-2x^2-x$
$\frac{1-csc^2\theta\:\:}{cot\:\theta\:\:-\left(cot\:\theta\:\right)\left(csc\:\theta\:\right)}$
$\frac{d}{dx}\left(\arccot\left(2x^2\right)\right)$
$\frac{\left(cot\theta\:+1\right)\left(cot\theta\:+1\right)-csc^2\theta\:}{cot\theta\:}$
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