$\frac{-\cos\left(2\right)}{\sin\left(x\right)}=2\sin\left(x\right)-\csc\left(x\right)$
$\lim_{x\to-\infty\:}\frac{\sqrt{x^2+1}}{x+2}$
$-\frac{y}{2.2}=-5$
$\left(12cd+14ef\right)\left(12cd-14ef\right)$
$\left(-9b^2+6b\right)^3$
$3^2\:x\:\:3^7$
$\lim_{x\to0}\left(\frac{x^2+10sin\left(x\right)}{x}\right)$
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