$\frac{cos^2x.secx+2cotx.senx}{1-sen^2}$
$3mn+4m+2mn$
$\frac{6x^4}{2x^3}$
$x^3+\frac{8}{x}-2$
$2xy+6xy-5y$
$\lim_{x\to5}\left(\frac{x-4-\sqrt{x^2-24}}{x-5}\right)$
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