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Mathematics, 28.10.2019 07:31 brianna218208
Derive these identities using the addition or subtraction formulas for sine or cosine:
a. sin a sin b = 1 / 2(cos(a – b) – cos(a + b))
b. sin a cos b = 1 / 2(sin(a + b) + sin(a – b))
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Derive these identities using the addition or subtraction formulas for sine or cosine:
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