Asked by cas

verify the identity
2sin^2(x/2)+4cos^2(x/2)-3=cos(x)

Answers

Answered by oobleck
2sin^2(x/2)+4cos^2(x/2)-3
= 2sin^2(x/2)+2cos^2(x/2) + 2cos^2(x/2)-3
= 2 + 2cos^2(x/2) - 3
= 2cos^2(x/2) - 1
= cos(x)
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