Example

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

Question

$$\sin ( 2 \tan ^ { - 1 } \frac { 2 } { 3 } ) + \cos ( \tan ^ { - 1 } \sqrt { 3 } )$$

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