$\frac{\csc\left(\theta\right)}{\csc\left(\theta\right)-\sin\left(\theta\right)}$
$\int tanh\left(x\right)sech^2\left(x\right)dx$
$6k\:-3k^2\:+\:-4k^2\:+\:2k\:+\:-9k^2$
$\sqrt{3^2+2^2}$
$2x^2+5x-3$
$\int a^{5nx}dx$
$\left(ab-4\right)\left(ab+8\right)\:$
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