AnswersMathematics III ATrigonometric Double Angle IdentitiesQuestion 9
9
QuizMultiple Choice

Trigonometric Double Angle Identities

Question 9 of 10 • 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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