$\lim_{x\to\infty}\left(\frac{15x^2-2x+3}{5x^2-7}\right)$
$10sin^2\left(x\right)-3sin\left(x\right)-1=0$
$\frac{csc\left(u\right)+cot\left(u\right)}{\sin\left(u\right)+tan\left(u\right)}=csc\left(u\right)\cdot cot\left(u\right)$
$2x^{2}y^{-8}$
$15x+20x$
$\frac{z^2-25}{z^3-125}$
$2x+2+7x$
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