Example

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

Question

$$\cos^{8}\theta+\sin^{8}\theta=1-\sin^{2}2\theta+\frac{1}{8}\sin^{4}2\theta$$

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