$x^2-4x\:-8y-12=0$
$\frac{cos^2}{1-cos^2}$
$\lim_{x\to0}\left(\frac{1-\cos\left(3x\right)}{1-cos\left(x\right)}\right)$
$13>5+x$
$\frac{e^x}{e^{-2x}}$
$3-sen\:x\:\:-\:\left(cos^{2\:\:}\right)$
$3n^{5\:}\cdot5n^{10}$
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