$sin10x-sin8x-sin6x+sin4x$
$b^2+b-12=0$
$\frac{2y^2}{y-5}$
$\frac{4x^2-1}{2x-1}$
$\frac{d}{dx}8^{x-3}$
$\frac{d}{dt}\left(i=\frac{1}{2}z^2+3z+2w^2-w+100\right)$
$\int\:2x^2e^{2x}dx$
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