$\frac{2x^3-7x^4-13}{4x^2-6x+8}$
$-15+13\cdot\left(6+\left(-20\right)\right)+\left(-12\right)\cdot\left(-6\right)$
$\frac{10}{-10}$
$\lim_{x\to0}\left(\frac{x-\tan\left(x\right)^{-1}}{\sin\left(x\right)^3}\right)$
$\frac{x^3-5x^2+3x+9}{x-1}$
$4\left(2+x^2\right)$
$\frac{1+cosx}{sinx+cosxsinx}$
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