Example

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

Question

$$Prove---thatCos( \frac{ \pi }{ 4 } +x)+Cos( \frac{ \pi }{ 4 } -x)= \sqrt{ 2 } COSx$$

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