$sen\:\left(x+y\right)$
$9x+2x$
$1+2\sin x\cos x=1$
$5x-2\left(x+3\right)\le x$
$\frac{dy}{dx}\left(y^2=5x\right)$
$1+6+8-87x$
$\frac{dy}{dx}\:2xy=1$
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