$\left(z^2-w^2\right)=\left(w^2-z^2\right)$
$\int x.y\:dy$
$3a-2=7$
$18x^2-13x+5$
$-15m+18m$
$cos\left(4x\right)-cos\left(8x\right)$
$\left(9x^6-100t^4\right)$
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