$\frac{sen^4\left(x\right)-cos^4\left(x\right)}{1-cot^4\left(x\right)}=sen^4\left(x\right)$
$2x+3<4$
$25^{.5}$
$\:3sen125\cdot\:\:cos125$
$\left(\frac{2}{3}x-6y^2\right)^2$
$2a-8ab$
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