$\left(3x^2+3\right).\left(3x^2-6x+3\right)$
$\int\frac{3}{\left(x^2+4\right)\left(x^2+9\right)}dx$
$\cot\left(x\right)=-\frac{2\sqrt{5}}{5}$
$\left(x^2+6\right)\left(x^2-2\right)$
$cosx^{\frac{1}{sin^22x}}$
$\lim\:_{x\to\:\:64}\left(\frac{\sqrt{x}-8}{\sqrt[3]{x}-4}\right)$
$f\left(x\right)=\:6x^2+\:8x^2-7x+6$
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