OpenStax, Algebra and Trigonometry 2e §9.3 Double-Angle, Half-Angle, and Reduction Formulas · Exercise 4 · Trigonometry · Compound & multiple angles
Double-Angle, Half-Angle, and Reduction Formulas · Exercise 4
For the half-angle formula given in the previous exercise for explain why dividing by 0 is not a concern. (Hint: examine the values of necessary for the denominator to be 0.)
This exercise builds on another exercise in its source book, which isn't shown here.
OpenStax, Algebra and Trigonometry 2e · §9.3 Double-Angle, Half-Angle, and Reduction Formulas · Exercise 4
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