$\pi-\frac{\pi}{3}$
$21x^2\:-55x\:\:+14$
$y\cdot\:5^y\sqrt{x^2-9}dy-xdx=0$
$-3x+\frac{1}{2}\le4$
$\lim_{x\to1}\left(\frac{2x^2-2}{x-1}\right)$
$\left(\tan x+1\right)\left(\csc x-2\right)=0$
$\int\left(t^3\left(8+t^4\right)^3\right)dx$
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