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Mathematics
Amiah Bailey
19 December, 14:20
Prove 2SinAsinB = cos (A-B) - cos (A+B)
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Moreno
19 December, 14:30
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Right side of the equation:
cos (A - B) - cos (A + B) =
= cos A cos B + sin A sin B - (cos A cos B - sin A sin B) =
= cos A cos B + sin A sin B - cos A cos B + sin A sin B =
= 2 sin A sin B - left side of the equation (correct)
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