$\int\frac{6}{x^2\sqrt{x^2-1}}dx$
$\lim_{x\to+\infty}\left(\frac{x\left(5+sin6x\right)}{x+3}\right)$
$7b-15\le\:\:\:5b-3$
$\left(2x^2+5y\right)+\left(6y+7x^2\right)$
$\lim_{x\to0}\left(\frac{1}{cscx}\right)$
$\int\frac{\sqrt{7-x^2}}{\sqrt{x^2}}dx$
$20+90+51w$
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