$\left(2+x+2x^2\right)^4$
$x^2+9\le0$
$.-\:\left(\:-3xw\:+\:9ab\right)\left(\:3xw\:+\:9ab\right)\:$
$\frac{4x^4-2x^3+x-7}{2x^2-1}$
$2cos2y=1$
$\lim_{x\to-5}\left(-x^2+7x+10\right)$
$y^2\:-2y\:-1$
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