Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$COS \frac{ 6 }{ 3 \sqrt{ 6 } }$$

Evaluate

$\cos(\frac{\sqrt{6}}{3})\approx 0.684778526$

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