$x^{21}\cdot y^{-21}$
$\frac{dy}{dx}\left(2x\cos\left(3y\right)+4x\sin\left(y\right)=0\right)$
$\left(k^2+k\right)^2$
$\sin^2\left(x\right)+2\cos\left(x\right)+7$
$\sec\left(x\right)\left(1-\sin^2\left(x\right)\right)\csc\left(x\right)=\cot\left(x\right)$
$\frac{dn}{dt}=1000-n\cdot0.5$
$120\cdot17$
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