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If

heta is an angle, which of the following sets represents all angles having the same initial and terminal arms as

heta?

Answer and explanation

Correct answer: \(\theta+2n\pi,\; n\in\mathbb{Z}\)

One complete revolution measures \(2\pi\) radians. Hence, adding or subtracting \(2n\pi\) from \(\theta\) leaves its terminal arm unchanged. Adding \(n\pi\) generally gives the opposite arm. Exam tip: use \(2\pi\) for coterminal angles.

Related tags

Trigonometric FunctionsAnglesCoterminal AnglesRadiansAngle MeasureMathematicsClass 12 Mcq

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