$\frac{x^4+4x^3+6x^2+ax+b}{x^2+2x+1}$
$7m^6n^2-14m^5n^3+21m^4n^4-28m^3n^5$
$\sin^4\left(z\right)-\cos^4\left(z\right)$
$\left(2r^2s-r^2s^6\right)^2$
$2x-6=4$
$\frac { n } { n }$
$\int\left(x^2+4x-5\right)\cos\left(x\right)dx$
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