$b\:\:\left(12-b\right)+\:4b-2b$
$\frac{2x^{-1}y^4\cdot\:2x}{\left(2y^2\right)^4}$
$\left(x^2+1\right)\left(x+1\right)^2$
$a^2+2ax^2+a\cdot x$
$200x^2-1250$
$cot\left(\frac{x}{2}\right)=0$
$4r^4-28r^2s^2+49^4$
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