$\frac{\cos^{2}\left(-x\right)\csc x}{\cot x}$
$\int\frac{1}{x^2\sqrt{x^2+a}}dx$
$\int\frac{1}{x\:\left(ln\:x\right)^k}dx$
$2x+y;\:x=7;\:y=10ab$
$\frac{d}{dx}y=4ax^3$
$xy+zw-zy-zw$
$4x^2-10x-3$
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