$14-18\left(-16+14\right)$
$\frac{1+sin\theta\:}{1-sin\theta\:}=\frac{csc\theta+1}{csc\theta-1}$
$\int\frac{x^2}{x-7}dx$
$a^5\cdot a^2$
$2-1\left(3+x\right)=5$
$2axy\:-\:3xya$
$\left(8\right)\left(729\right)$
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