$\frac{1-cos^2.x}{\csc^2x}$
$\frac{14x+21y}{50x+71y}$
$\frac{x^6}{1+x^6}$
$\frac{dy}{dx}=\frac{\cot\left(x\right)}{\tan\left(y\right)}$
$\int\left(arctan\left(\frac{1}{\sqrt{x}}\right)\right)dx$
$4a^2-3a-a^2+5a$
$\:120-5.5$
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