$\frac{d}{dx}\ln\left(y\right)^9$
$\frac{y^9\left(y^3x^{-2}\right)^{-3}}{\left(5y^2\right)^4x^2}$
$\sqrt{5+2}\sqrt{6}\cdot\:\sqrt{5-2}\sqrt{6}$
$4x^4+13x^3+28x^2+25x+12\:entre\:4x^2+5x+6$
$2x-y=12$
$49-y^2-8y+15$
$4\:+\:3\:+\:9\:+\:4\:+\:6$
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