$\lim_{x\to0}\left(\frac{1}{\left(tan\left(x\right)^{-1}\right)^2}\right)$
$\frac{15}{3}xy-\frac{2}{6}yx$
$\sin\left(x\right)+\cos\left(x\right)=\sin\left(x\right)\left(1+\cot\left(x\right)\right)$
$\int20x\sin\left(5x^2-3\right)dx$
$\left(4\right)^3+\left(4\right)^2+5\left(4\right)-9$
$\frac{8x^3+27y^3}{2x+3y}$
$\frac{dy}{dt}=2\left(10-y\right)$
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