$\left(a-17\right)\left(a-7\right)$
$\frac{cot\theta}{cos\theta}=csc\theta$
$45\:x^2\:y\:-\:60\:x\:y^2\:+\:90\:y^4$
$\left(x-3\right)\left(x^2-2x+1+\frac{5}{x-3}\right)$
$\sqrt{34+15}$
$\int\frac{1}{16-9\cdot x^2}dx$
$\frac{x^4y^4}{2y^4}$
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