$-\frac{420}{-6}$
$ydx+xdy$
$\frac{d}{dx}18x^2+y^2=6$
$\frac{\left(7\left(2senx\right)^2\right)}{4-\left(2senx\right)^2}$
$4tan\left(x\right)-3=1$
$-3x\left(x+9\right)>0$
$2y-5y$
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