$2\left(1\right)^2+2\left(1\right)-4$
$3y^2y'+y^3=e^{-x}$
$\left(12x^6-2\right)^3$
$\left(2x-\frac{1}{3}x^2\right)\left(2x+\frac{1}{3x^2}\right)$
$3sec^2x\:-\:2tan^{2\:}x\:-\:4\:=\:0\:$
$x^2+8x+7$
$\lim_{x\to0}\left(1+\frac{2}{x}\right)^{2x}$
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