$\lim_{x\to0}\left(15\tan\left(x\right)\right)^x$
$\left(\frac{x^3-27}{a-1}\right)\left(\frac{a^2+a+1}{x^2+3x+9}\right)$
$-14x^2\:+\:12x\:+\:26$
$\frac{\cot\left(x\right)\cos\left(x\right)}{\sin\left(x\right)}=\cot^2\left(x\right)$
$\left(x+9\right)\cdot5$
$\int_{\frac{u}{v}}^1\left(x\right)dx$
$\int_1^9\left(e^{2\sqrt{x}}\right)dx$
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