Answers Mathematics III A Trigonometric Double Angle IdentitiesQuestion 9

9

QuizMultiple Choice

Trigonometric Double Angle Identities

Question 9 • Mathematics III A

Let cos(2x) – cos(x) = 0, where 0° ≤ x ≤ 180°. What are the possible values for x?

Answer

A

60° only

B

120° only

C

0° or 120°

D

60° or 180°

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