$\frac{cos\left(a+b\right)}{cos\left(b\right)}$
$\frac{x^2+5x+7}{x+3}$
$x^2-4xy+2y\:=\:4$
$2cos\:6x\:cos\:2x\:+2sin\:6x\:sin2x=1$
$\lim_{x\to0}\left(\frac{2cosx\:-+x^2}{x^2\sin x}\right)$
$4bm^3n+12m^2n-10abm-30a$
$3x^2-48x+256=0$
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