$\sin\left(\tan^{-1}\left(x\right)-\tan^{-1}\left(y\right)\right)$
$\frac{4}{3}-3x<-15$
$\left(x-3y\right)\left(x+12y\right)$
$\left(x^2y^3\right)\left(-x^5y^4\right)$
$\frac{dy}{dx}=\frac{x^2-6x+2}{y-2}$
$20+s^2-9s$
$3.77\cdot1.375$
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