$6cos\left(x\right)^2-cosx\:-2\:=0$
$y'+2y=e^{-2x}$
$\frac{2x^2}{x^2+4}$
$\left(x+9\right)\left(x-9\right)+82$
$7x^4+2x^4-6x^4$
$\tan\left(a-b\right)-\sin\left(a-b\right)+\tan\left(a\right)$
$\lim_{x\to1}\left(\frac{\sqrt{2-x}-\sqrt{x}}{x}\right)$
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