Example

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

Question

$$\cos 6x=32 { \cos }^{ 6 } x-48 { \cos }^{ 4 } x+18 { \cos }^{ 2 } x-1$$

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