$\csc^2\left(a\right)-\frac{1}{\tan^2\left(a\right)}$
$\left(x+9\right)\left(x+1\right)$
$\left(3b-2x\right)^2$
$16y^{2\:}+\:18+1$
$2.81+5.41+21.78+21.17+18.32+15$
$\lim_{x\to-3}\left(\frac{x^2}{e^{-3x}}\right)$
$\int\frac{\left(15^x+18^x\right)}{3^x}dx$
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