$\left(3\:x\:-\:5\right)\left(3\:x\:+\:5\right)$
$\frac{\cos\left(x\right)^2-\sin\left(x\right)^2}{\sin\left(x\right)\cdot\cos\left(x\right)}$
$u^2-v^2$
$f\left(x\right)=-2x^2+80x+300$
$\int\left(\frac{5}{\left(4+x\right)^2}\right)dx$
$\int x^{\frac{3}{2}}.dx$
$\lim_{x\to-7}\left(\frac{49-x^2}{\sqrt{9-x\:\:-\:\sqrt{2}}}\right)$
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