$\left(4x-3\right)\left(2+3y\right)$
$\lim_{x\to7}\left(\frac{x^3-3x+2}{x^2-x-6}\right)$
$\lim_{x\to3}-12$
$-4\left(8d\right)$
$\left(2a+3+2a^2+3a-5\right)+\left(-3a^2-5a^2+a\right)$
$\left(n+2\right)^2-\left(n+2\right)$
$\frac{\left(-1+sin^2x\right)}{cosx}$
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