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Which is the principal coterminal angle of 14π/3?

Answer and explanation

Correct answer: 2π/3

The governing concept is coterminal angles measured in radians. One complete revolution equals 2π radians, so coterminal angles differ by an integral multiple of 2π. The principal representative is normally selected in 0 ≤ θ < 2π. Since 14π/3 is larger than 2π, subtract two complete revolutions: 14π/3 − 4π = 14π/3 − 12π/3 = 2π/3. This value lies in the principal interval, so option C is correct. Equivalently, subtracting 2π once gives 8π/3, which is still too large, and subtracting it twice gives 2π/3. The other listed values have different terminal sides and are not equivalent to the given angle.

Related tags

Trigonometric-FunctionsAnglesRadian-MeasureTrigonometric FunctionsMathematicsClass 12 Mcq

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