$\frac{\pi\:}{\:4}0.000315$
$y=\frac{4x^2-3x}{2x+1}$
$\lim_{x\to0}\left(\frac{2}{x^{-x}}\right)$
$\frac{4x^3+7x^2-8x}{x-1}$
$a-bcosx=y$
$\:\lim_{w\to-2}\frac{27x^3-8}{9x^2-4}$
$\left(1-\cos^2x\right)\cot\left(x\right)$
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