$\int t\cdot sin\left(t\right)\cdot e^{-st}\:dt$
$\frac{x}{x-1}+\frac{2}{x}=\frac{3x-2}{x^2-x}$
$\left(1+y^2\right)dx=x\:dy$
$\int\frac{13}{x\left(x+1\right)}dx$
$-2x-x+7y-5y$
$\left(x-2\right)\left(2-x\right)$
$9.1^2$
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