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If sin x = 1/2, what are the values of x in 0 ≤ x < 2π?

Answer and explanation

Correct answer: π/6, 5π/6

This is a trigonometric-equation problem on one complete interval. The reference angle for sin x = 1/2 is π/6 because sin(π/6) = 1/2. Sine is positive in the first and second quadrants, so the solutions in 0 ≤ x < 2π are π/6 and π − π/6 = 5π/6. Thus option A is correct. Option B uses π/3, but sin(π/3) = √3/2 rather than 1/2. The angle 7π/6 in option C lies in the third quadrant, where sine is negative. Option D also includes third-quadrant 7π/6 and omits the first-quadrant solution, so it cannot satisfy the equation.

Related tags

Trigonometric-EquationsSineQuadrantsTrigonometric EquationsTrigonometric FunctionsMathematicsClass 12 Mcq

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