$\frac{1}{\tan\left(90-x\right)}$
$\frac{2-\csc\left(^2\right)x}{\csc\left(^2\right)x}$
$\int x^2\sqrt{x^3+21}dx$
$\int-2\cos\left(3x\right)dx$
$\int\frac{\left(2x+3\right)}{sqrt\left(x^2-2x+3\right)}dx$
$20+90+513$
$3\frac{dy}{dx}+12y=3e^{2x}$
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