$x^2\frac{dy}{dx}-2y=3y^{-4}$
$-\int\frac{sen\:\left(x\right)}{1+cos\left(x\right)}dx$
$\frac{x^2-1}{x^2-1}$
$\lim_{x\to\infty}\frac{\sqrt{4x^4-x}}{2x^2+3}$
$6x-7=2x+5$
$1.6458+4.6458$
$8^{-3}\cdot8^4$
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