$cot\left(x\right)cos\left(x\right)-cot\left(x\right)$
$3x+38-4x+39$
$\sqrt{6+\sqrt{7+\sqrt{4}}}$
$-3\sin^2\left(x\right)$
$16x^2+40xy^2+25y^4$
$3^3\cdot6$
$\frac{d}{dx}\left(y\cdot e^{-x}-y^3-3x\right)$
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