$16y^2+4y^2-8$
$x^2-2x-6$
$x+3<3x-2$
$\left(3x-4v\right)^2$
$3\:\left(3-4\right)\:-5\:\left(2\cdot3-1\right)$
$38\cdot8$
$\lim_{x\to0}\left(\frac{tan\:4x\:-\:sen\:3x}{4x\:-\:tan\:5x}\right)$
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