$x^4-2x^2+2\:.\:x^2-2x+3$
$\lim_{x\to-2}\left(\frac{x-2}{\sqrt{x}-2}\right)$
$\int x^2sin\left(\frac{nx}{2}\right)dx$
$\frac{6}{m^{-3}}$
$1x^2-14x+49$
$\left(9x^2+7x-6\right)-\left(3x^2-8x+7\right)$
$2x+1=15$
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