$\frac{-2sen^2x}{4}=senx$
$\frac{-4x-7}{8}\ge2$
$24x^2-38x+15$
$6.67+1.2+2.23$
$72\sqrt{-8}$
$\lim_{x\to1}\left(\frac{e^{2\cdot\left(x-1\right)}-1}{\sqrt{4x^2-5x+1}}\right)$
$2cos\left(2x+1\right)\:+\:sin8x-1$
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