$\frac{x^3+x^2}{x^2-4}$
$y\:x\:2x\:^4y^2$
$4x^2+8x-1$
$3x\cdot x^2-1$
$\frac{2}{3}m+\frac{4}{3}m^2-\frac{8}{3}m^3$
$\log10\left(40\right)+\log_{10}\left(2.5\right)$
$cotx\left(1-cos^2x\right)=\frac{1}{2}sin2x$
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