$4\ge3x+5$
$\frac{2\left(cosx\right)^2}{2cosx-senx}$
$3,18+5,4$
$\lim_{x\to0}\left(e^{\frac{2}{x}}-\frac{2e^{\frac{2}{x}}}{x}\right)$
$c+2c-2a+5ac$
$y'=x^3$
$x^{2}+14x-49$
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