$sinx=-\frac{2}{3}$
$4y^2+32xy$
$\frac{sen^{2\:}x}{cos^2x}+\frac{cos^2x}{sen^2x}-\frac{1}{sen^2x}$
$4x-8<x-2$
$\lim_{x\to0}\:\frac{1-\cos\left(3x\right)}{6x}$
$2x+y;\:x=7;\:y=10n$
$a\left(x+1\right)+b\left(x+1\right)$
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