$\left(-9\right)\cdot\left(-14\right)$
$\left(x^{a-3}-7\right)^2$
$4x^3dx+4y^3dy=0$
$14x+49$
$5mn^2\:;\:m=-1\:,\:n=-3$
$\cos\left(2x\right)\cot^2\left(x\right)-\cot^2\left(x\right)$
$\frac{15^4}{15^{10}}$
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