$\int\left(\tan^3\left(2x\right)\sin^2\left(2\right)\right)dx$
$\frac{\csc^2a}{\cot a}=\csc a\sec a$
$4\sin^2\left(x+30\right)=1$
$\frac{x-2}{x-1}\le2x-1$
$\left(x^4y^5-3z\right)\left(x^4y^5-5z\right)$
$\frac{2}{x-1}=1+\frac{x+2}{x^2+x-2}$
$ax^2-ax-2a$
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