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OpenStudy (kittykr98):
I need help with trigonometric identities.. About to post the question. Who can help me?
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OpenStudy (kittykr98):
Derive this identity from the sum and difference formulas for cosine Sin a sin b = 1/2 (cos(a-b)- cos(a+b)) Start with the right hand side since it is more complex Calculation: reason:
OpenStudy (kittykr98):
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