$\frac{3x^2-x}{x^2-1}$
$\left(b+4\right)\cdot\left(b-4\right)$
$\int_0^1\left(\frac{1}{x^3}\right)dx$
$x p 1 + 2 ^ { x }$
$36b^2-25=\left(6b-5\right)\left(6b+5\right)$
$15-1651$
$2\sin\left(x\cos^2\left(x\right)\right)$
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