$\frac{x+2}{x}+\frac{x+1}{x+3}=\frac{2}{x^2+3x}$
$\left(3n+2\right)^3$
$\int\frac{\left(4x+3\right)}{e^x}dx$
$9y^2-x^2y^2$
$\left(4b^2\right)\left(7b^2\right)$
$\int_a^b\left(e^{-t^2}\right)dt$
$8\cos^2\left(30\right)-6\cos\left(60\right)+1$
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