$\cot\cdot\frac{\csc x}{\sec x}$
$-1\left(4y-1\right)^4$
$3\sqrt{2}^2$
$\:y\frac{dy}{dx}=\left(1-y^2\right)senx\:$
$\left(m^2n^{-4}\cdot m^3n^2\right)^{-1}$
$9x^2+12+16$
$-\frac{2}{t+2}+\frac{5}{t+2}=-7+\frac{3}{t+2}$
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