$2mn+6mn-5mn$
$cos\left(4x\right)=2\left(2cos^2\left(x\right)-1\right)^2-1$
$2ab+ab$
$x^4+x^3-31x^2-25x+150$
$sec=\frac{29}{20}$
$\lim_{x\to1}\left(\frac{2x-2}{in\left(x\right)}\right)$
$x^2+7x+12\cdot x^2+5x+6$
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