$\left(z^2f^3-8\right)^2$
$\lim_{x\to-1}\left(ax^2-bx\right)$
$15-1651$
$b^7+1$
$\frac{2\cos\:\left(x\right)\sin\:\left(x\right)}{\cos\:^2\left(x\right)}$
$5\left(x+3\right)\le3\left(x+7\right)$
$\left(4x^2-3\right)\left(2x+6\right)$
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