$\lim_{x\to0}\left(\frac{e^x-e^{-x}-2x}{sen^2x}\right)$
$-2x+4y+6x+9y$
$\lim_{x\to0}\frac{\ln\left(1\:+\:sin^2\left(2x\right)\right)}{1\:-\:cos^2\:x}$
$-xy^2+y^2$
$2x-4\le4x+2$
$4x-y+3z=8$
$\int\left(\frac{x}{\left(x^2+a^2\right)^n}\right)dx$
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