Example

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

Question

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

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