$\frac{40xy^2}{2^3xy}$
$\left(\sin\left(b\right)+7\cos\left(b\right)\right)^2$
$0.123+0.085+0.007$
$-0.23d+d+0.77d$
$\frac{dy}{dx}=y=e^{4x}-5\sin\left(x\right)$
$\sen^{2}\theta\left(1-\cot^{2}\theta\right)$
$3x=21$
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