Prove that: 2cos(π/4+theta) cos (π/4-theta)=cos 2theta
Shubham agarwal , 7 Years ago
Grade 10
Trigonometry> Prove that: 2cos(π/4+theta) cos (π/4-thet...
1 Answers
Arun
Last Activity: 7 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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