$x^2+a=\left(x+4\right)\left(x+b\right)+8$

$c\left(x\right)\:=\:2x\:+\:30.$

$\lim_{x\to\frac{1}{2}}\left(\frac{4-32x^3}{1-4x^2}\right)$

$\frac{\left(-x^2+x+1\right)}{\left(x+3\right)}$

$f\left(x\right)=8x\:sin\:x\:+\:10\:cos\:5x$

$\left(x^{-1}y^4-2z^3w^{-3}\right)^2$

$\left(5x^2+4mn^3\right)^5$