$a^{-m}=\frac{1}{a^{m}}$
$x^2-3x+x^2$
$2\left(x+3\right)dx-\left(xy\right)dy=0$
$4b+5+\left(2b+7\right)+\left(8-5b\right)$
$\frac{2\cos\left(x\right)+5\cos\left(x\right)+3}{\cos^2\left(x\right)+2\cos\left(x\right)+1}$
$\frac{0.1414}{2}$
$8\cdot7\cdot6\cdot5$
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