Peyton L.
asked • 05/07/21Use the half angle formula to simplify the given expression.
Use the half angle formula to simplify the given expression.
√1+cos8x/2
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1 Expert Answer
Mark M. answered • 05/08/21
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Retired Math prof with teaching and tutoring experience in trig.
cos(x/2) = ±√ [(1+cosx)/2]
So, √ [(1+cos(8x))/2] = cos(8x/2) = cos(4x)
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