$8y^2x^3\cdot6x^2$
$m^2+7mn-4m^2-6mn+3m^2$
$7x-x^2-12=0$
$2x-1>4x+2$
$\left(\frac{\left(x+1\right)}{\left(2x\right)}\right)^9$
$xy'=2x+3y$
$\cos^2\left(x\right)-\sin^2\left(x\right)\cos^2\left(x\right)=\cos^4\left(x\right)$
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