$\sqrt{28w}+\sqrt{63w}$
$3.8\:x\:0.6$
$\sec\left(a\right).\cos\left(a\right)ca$
$\frac{\left(8x^3-6x^2y-9y^3\right)}{x^2y}$
$\left(2x-4\right)\left(2x+4\right)=2x^2$
$6x^4\::\:2x^2$
$\sin2t\cos^2t$
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