Example

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

Question

$$\sin^{\circ3}\frac{2a}{9}-\sin^{2}\frac{2}{9}-\frac{3}{4}(sin\frac{2a}{9}-sin\frac{\sigma}{9})$$

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