Question
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Sin(A/2)=root(1/2(1-cosA)??
Sin(A/2)=root(1/2(1-cosA)??
Answers
Steve
remember your double-angle formula?
cos(2x) = 1 - 2sin^2(x)
That means that
cos(x) = 1 - 2sin^2(x/2)
That should help.
cos(2x) = 1 - 2sin^2(x)
That means that
cos(x) = 1 - 2sin^2(x/2)
That should help.