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19 December, 14:20

Prove 2SinAsinB = cos (A-B) - cos (A+B)

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  1. 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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