$\left(x^2+y^2\right)dx+\left(2xy+3y^2\right)dy$
$\frac{-14x^4y^7}{-6x^5y^4}$
$4x^2+4x+-8$
$\sin\left(3x\right)=\left(\sin\left(x\right)\right)\left(3-4\left(\sin\left(x\right)^2\right)\right)$
$\left(x-1\right)\left(x+1\right)\left(x^2+1\right)$
$\frac{12x+7}{x^2-x-2}$
$3\cdot4+5$
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