Example

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

Question

$$[ \cos ^ { - 1 } \frac { 4 } { 5 } + \tan ^ { - 1 } \frac { 2 } { 3 } ]$$

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