$\left(m^2-n^2\right)\cdot\left(m-n\right)\cdot\left(m-n\right)$
$\sin2c\cdot\sin c=\cos c$
$\left(x^2y+1\right)\cdot\left(x^2y-1\right)$
$x^2-12x=21$
$cosx\:=\:\frac{4}{5}$
$2^{2x}=2^{3x-4}$
$\lim_{x\to3}\left(4-4x\right)$
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