Example

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

Question

$$\tan 20 ^ { \circ } \tan 40 ^ { \circ } \tan 80 ^ { \circ } = \sqrt { 3 }$$

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