$dy\:=\:\left(\sin\left(x\right)\cos\left(y\right)-\cos\left(x\right)\sin\left(y\right)\right)dx$
$3x\cdot3$
$3x^2+2x-2xy$
$\int\frac{5}{\sqrt{x^2-8}}dx$
$3\left(x+12y\right)=3x+36y$
$24x^2-19x+2$
$x^2+27x+162$
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