$\sin\left(\sin^{-1}\left(x\right)+\cos^{-1}\left(y\right)\right)$
$x^2+18x=81$
$\left(-2yz^2+yz^2\right)$
$\lim_{x\to0}\left(\frac{1-e^{u^2}}{sen^2\left(u\right)}\right)$
$5-x<12$
$\frac{d}{dx}\left(x^{-2\ln\left(x\right)}\right)$
$\sin\left(23.57\right)$
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