$y^6\:\cdot y^{-6}$
$\frac{3x}{4}+\frac{x}{8}-\frac{x}{2}$
$-k+4k=21$
$\lim_{x\to0}\left(\frac{tanx}{\sqrt{x}}\right)$
$\int_0^2\left(\frac{1}{2}x^2e^{-x}\right)dx$
$-4x^2+4x+7$
$-6cx+1-9cx+1$
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