$84+15$
$\frac{sen^3\left(a\right)a+\:\sin\left(a\right)\left(\cos\left(a\right)\right)^2}{\sin\left(a\right)}=1$
$\left(9-t\right)\left(9-t\right)$
$\left(x^2+4\right)^2ydx=x\left(y^2+9\right)dx$
$\frac{dx}{dt}=\frac{-t\:+8}{2}$
$\left(2a^2-3b+4c^3\right)^2$
$\left(3y+2xz^2\right)^3$
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