English, asked by gomza, 2 days ago

prove that cos7A +cos A = 2cos4Acos3A

Answers

Answered by sindhussindhus61

4

cosx+cosy=2cosx+y/2. cosx-y/2. cos7a+Cosa=2cos((7a+a)/2).cos((7a-a)/2) . =2cos8a/2.cos6a/2. =2cos4acos3a=Rhs

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