$1-cos8\theta\:\:=2sin^24\theta\:\:$
$x^3-7x^2-9x+63$
$\frac{d}{dx}\left(\frac{7x^2}{1-e^x}\right)$
$\left(\frac{\sqrt{2}}{2}_+\frac{\sqrt{2}}{2}i\right)^2$
$\left(x^2-6x^2\right)^2$
$2\sin\left(a\right)-5\sin\left(b\right)+2=0$
$93.5\cdot1000$
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