07-03-2017
Mathematics

contestada

sin(a+b) + sin (a-b) = 2 sin a cos b

verify the identitiy

sinab sin ab 2 sin a cos b verify the identitiy class=

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Jayland Jayland

08-03-2017

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

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