$\frac{27x^3-1}{3x-1}-\frac{8x^3+1}{2x+1}$
$\:2x\:x\:5x$
$3.01+5$
$\frac{dy}{dx}=y^2cos\left(4x\right)$
$-70mn+25n^2$
$\lim_{x\to0}\left(cosx\right)^{x^{-4}}$
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