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Asked by Anonymous

If sin a + sinb + sinc = 4cosa/2cosb/2cosc/2
Then sin 2a + sin2b + sin 2c =
4cosacosbcosc
6 years ago

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Answered by oobleck
just replace a with 2a, etc.
the formula follows directly, since (2a)/2 = a, etc.
6 years ago
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Question

If sin a + sinb + sinc = 4cosa/2cosb/2cosc/2
Then sin 2a + sin2b + sin 2c =
4cosacosbcosc

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