Example

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

Question

$$5\ \cos^{-1}(-\frac{\sqrt{3}}{2})-4\ \tan^{-1}(\sqrt{3})+351r^{-1}(1)$$

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