$222-\left(-900\right)$
$4-tan^2x=7-2tan^2x$
$\tan\left(90-x\right)=\frac{1}{\tan\left(x\right)}$
$x^3+64=0$
$\left(x+7\right)^2=x^2+14x+49$
$6m^4x^3+12m^3x-18m^2x^4$
$abc-abc^2$
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