Solve the Equation on the Interval [0, 2π) $\cos 2 x = \frac { \sqrt { 2 } } { 2 }$

question 60

Multiple Choice

Solve the equation on the interval [0, 2π) .
- $\cos 2 x = \frac { \sqrt { 2 } } { 2 }$

• A) \(\frac { \pi } { 8 } , \frac { 7 \pi } { 8 } , \frac { 9 \pi } { 8 } , \frac { 15 \pi } { 8 }\)
• B) \(0 , \frac { 2 \pi } { 3 } , \pi , \frac { 4 \pi } { 3 }\)
• C) \(\frac { \pi } { 4 } , \frac { 3 \pi } { 4 } , \frac { 5 \pi } { 4 } , \frac { 7 \pi } { 4 }\)
• D) no solution