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Sin(a+b) + sin (a-b) = 2 sin a cos b verify the identitiy
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Sin(a+b) + sin (a-b) = 2 sin a cos b

verify the identitiy

Sin(a+b) + sin (a-b) = 2 sin a cos b verify the identitiy-example-1
User Andyderuyter
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1 Answer

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Write out the sum formula for sin
sin(x + y) = sinxcos + sinycosx

Then expand sin(a + b) + sin(a - b)
sinacosb + sinbcosa + sinacosb - sinbcosa
The 2nd and 4th terms cancel and you get
2sinacosb
User Bwroga
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