$\left(-21\right)-\left(-21\right)-\left(-6\right)$
$\frac{1}{2a}^3.$
$5x^7+3x^5-7x^2$
$\frac{d}{dx}22x^2+1\:=22x+1$
$3\tan\left(2x\right)-\sqrt{3}=0$
$x^2+12x-90$
$\frac{dy}{dx}=\frac{\left(2x-seny\right)}{\left(xcosy\right)}$
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