$\frac{48}{2x}$
$sen\frac{\pi}{3}cos\frac{5\pi}{6}+cos\frac{\pi}{3}sen\frac{5\pi}{6}$
$0.81g^2-\left(f+m\right)^2$
$121 x ^ { 2 } - 81$
$\left(100\cos\:\left(20t\right)\right)^2$
$2ab-11ac+4ab\left(a=2;b=4;c=-1\right)$
$3ab^2\:\frac{1}{4}$
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