$\frac{\left(5m+6n\right)^2-\left(5m-6n\right)^2}{60}$
$x^2=-4y$
$\frac{5xy^3}{125x^2y^7}$
$6,703-3746$
$\left(x+iy\right)\left(x+iy\right)\left(x+iy\right)$
$\left(1+sen\left(x\right)\right)\frac{dy}{dx}=y\cdot cos\left(x\right)$
$7\:.\:9\:-2$
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