Find All Solutions to the Equation in the Interval [0 $\cos x - \cos 3 x = 0$

question 292

Multiple Choice

Find all solutions to the equation in the interval [0, 2) .
- $\cos x - \cos 3 x = 0$

• A) \(0 , \frac { \pi } { 2 } , \frac { 3 \pi } { 2 }\)
• B) 0
• C) \(\frac { \pi } { 2 } , \frac { 3 \pi } { 2 }\)
• D) \(0 , \frac { \pi } { 2 } , \pi , \frac { 3 \pi } { 2 }\)

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