$\lim_{x\to3}\left(\frac{2x-6}{\frac{1}{x^2}-\frac{1}{9}}\right)$
$\left(f^4-2\right)\left(f^4+5\right)$
$\int\:\:\frac{1}{x\sqrt{4x^2+81}}\:dx$
$\frac{dy}{dx}=\frac{1}{x\left(x-1\right)}$
$\:cos\:2\:x\:+\:2\:=\:\:sin\:x\:\:$
$20\cdot70$
$3^2-1$
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