$-2\:sen\:x\:+\:1\:=\:0\:\:$
$\frac{2-2x}{x-3}\ge2$
$\lim_{x\to0}\left(\frac{sin\left(3x\right)}{9x^7+x^6+x^5+x}\right)$
$7+3r<4$
$\ln\left(x\right)-\ln\left(x+6\right)=0.5\ln\left(9\right)$
$-x+3>7$
$4^{-2}x^{-1}y^2$
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