Example

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

Question

$$\frac{ \tan 45 ^ { \circ } }{ \tan 30 ^ { \circ } + \tan 60 ^ { \circ } }$$

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