$9\left(-2\right)^2\:+\:12\left(-2\right)\:+\:6$
$-\tan\left(-x\right)\cot\left(-x\right)$
$\lim_{x\to0}\left(\frac{2x-1}{2x+1}\right)$
$2x^2y\:-3xy$
$x^3-14x^2+65x-100$
$\lim_{x\to0}\left(\frac{\left(x-5\right)}{x+5}\right)$
$\int4xln\left(x^4\right)dx$
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