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trigonometry!!!!!!!!!!!!!!!!!!!!!!

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how do I prove the following

2sin2 (A/2) + cos A = 1

asked Jun 26, 2013 in TRIGONOMETRY by mathgirl Apprentice

1 Answer

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The given that  2sin2(A/2) +cosA = 1

2sin2(A/2) +cosA  = 2 [ 1 - cosA ]/2 +cosA      [ sin2(A/2) = (1 - cosA)/2 ]

=  1-cosA +cosA  = 1

Hence it is proved.

answered Jun 26, 2013 by goushi Pupil

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