$\left(-5m-4n\right)^2$
$a+\frac{2a+2b}{5}$
$\frac{sen^2x}{\left(1-cosx\right)^2}1$
$2x+7y=0$
$\lim_{x\to\infty}x^{ln\left(\frac{\left(x+1\right)}{x}\right)}$
$\left(7y-a\right)^2$
$\frac{d}{dx}y=x\cdot\:\:in\cdot\:\:y+\sqrt{sen3x}$
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