Question: We can determine the half-angle formula for tan (x/2) = 1 cos x/1 + cos x by dividing the formula for sin (x/2)

We can determine the half-angle formula for tan (x/2) = ± √1 − cos x/√1 + cos x by dividing the formula for sin (x/2) by cos (x/2).Explain how to determine two formulas for tan (x/2) that do not involve any square roots.

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