$\left(4-y^2\right)\left(4+y^2\right)$
$4a+9^2$
$\frac{x+1}{x^2+2x}$
$-\frac{2}{5}w^{9}v^{3}+v^{3}\text{entre}-4v^{2}$
$\int cos\left(1-\frac{2x}{3}\right)\:sin\left(\frac{3x}{2}-1\right)\:dx$
$-6+11x^4+3x-2x^5\left(6+3x-4x^3\right)$
$-7mn\:+\:3mn$
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