Solve the equation (x in radians and ? in degrees) for all exact solutions where appropriate. Round approximate answers in radians to four decimal places and approximate answers in degrees to the nearest tenth.3 cos2? + 2 cos ? = 1
A. {51.8° + 360°n, 128.2° + 360°n}
B. {70.5° + 360°n, 180° + 360°n, 289.5° + 360°n}
C. {49.8° + 360°n, 130.2° + 360°n, 229.8° + 360°n, 310.2° + 360°n}
D. {103.2° + 360°n, 145.2° + 360°n, 283.2° + 360°n, 325.2° + 360°n}
Answer: B
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