$\left(3x^4+6x^3\right)cos\left(x\right)$
$\lim_{x\to2}\left(\frac{x^2-9}{x^2-5x+6}\right)$
$\left(2a+6\right)\left(2a-10\right)$
$7x^2+3x\left(1-8x\right)$
$-5x^63x^2-12x+30$
$\left(x-1\right)^4+\:\sqrt[4]{1+x}$
$\left(\frac{5}{1+x^2}\right)^2$
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