$-7x^2+3x+8=0$
$\int\:\left(x^3+x\right)\left(3x^2+2x+\frac{2}{x}\right)dx$
$\left(cotx+cscx\right)\left(cotx-cscx\right)$
$\tan^2x=\sqrt{3}tanx$
$x^{2\:}-\:x=-2$
$81x^2-16x^6$
$\left(2x^3\:+\:3x\:-\:5\right)$
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