$\lim_{x\to0}\left(\frac{x}{sin\left(\frac{x}{2}\right)}\right)$
$\lim_{x\to\infty}x^3e^{-x}$
$\int\sqrt{2-4x}dx$
$sec\left(2x\right)=\frac{-1}{1-2cos^2x}$
$( x + 3 ) ^ { 2 } ( x + 3 ) 2$
$-\left(-5\right)+\left(-3\right)-5-\left(+8\right)$
$2a^3-3a^2-6a+9$
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