$\frac{x^2}{x^{-2}}$
$\left(84\right)-\left(-16\right)$
$2sen^2a=21sen\:a+11$
$279.2+3.036$
$\frac{\left(1-cos\left(4x\right)\right)}{2}=sin^4x$
$\sqrt{x\left(x-1\right)}=\sqrt{6}$
$\frac{700}{2}$
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