$\left(-3\cdot5\right)-\left(\left(-2-5\right)\cdot7\right)+\left(-5+12\right)\cdot\left(6\right)$
$\lim_{x\to0}\left(\frac{x^2\sin\left(2x\right)-4x^2sin\left(2x\right)}{16x^5-3x^3}\right)$
$x^2-y^2\:\:si\:x=2,\:y=3$
$\frac{2x}{x+1}+\frac{x+2}{2x+1}$
$\frac{x^3+3x^2-x-3}{x+3}\:$
$\frac{2.1483}{20.014}$
$\left(\frac{1}{5}t^2-t^{-1}\right)^2$
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