$4-3\cdot6-6\cdot7$
$5x^2-18x+9$
$\frac{\sqrt{8}}{\sqrt{8}}$
$\left(xe^{-y}\:senxdx+ydy=0\right)$
$\sqrt[2]{x},\:x=4$
$3x\:+\:1\:\ge\:2x\:-\:3$
$8\sqrt{x^3}-12$
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