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Prove that: 2cos(π/4+theta) cos (π/4-theta)=cos 2theta

Prove that: 2cos(π/4+theta) cos (π/4-theta)=cos 2theta

Grade:10

1 Answers

Arun
25750 Points
6 years ago
We know the formula of 2 cosA cosB = cos(A+B) + cos(A-B)Put this formula here,We get,Cos(pi/2) + cos (2theta)0+ cos 2thetaCos 2thetaHence proved

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