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Prove that: Cos 5 theta+cos theta=2 cos 3theta . cos2 theta

Prove that: Cos 5 theta+cos theta=2 cos 3theta . cos2 theta

Grade:10

1 Answers

poojitha
42 Points
6 years ago
Cos 5theta +Cos theta=2 Cos(5theta+theta/2).Cos(5 theta-theta/2)=2Cos(6 theta/2).Cos(4 theta/2)=2 Cos(3 theta).Cos(2 theta).         [  Cos C+Cos D=2Cos(C+D/2).Cos(C-D/2)  ]

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