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Which angle is coterminal with \(\frac{5\pi}{8}\) and lies between \(-4\pi\) and \(-2\pi\)?

Answer and explanation

Correct answer: \(-\frac{27\pi}{8}\)

Coterminal angles differ by an integer multiple of \(2\pi\). Subtracting \(4\pi=\frac{32\pi}{8}\) from \(\frac{5\pi}{8}\) gives \(\frac{5\pi}{8}-\frac{32\pi}{8}=-\frac{27\pi}{8}\). Moreover, \(-4\pi=-\frac{32\pi}{8}< -\frac{27\pi}{8}< -\frac{16\pi}{8}=-2\pi\), so option D lies in the required interval. Option A differs from \(\frac{5\pi}{8}\) by \(-3\pi\), which is not an integer multiple of \(2\pi\). Exam tip: write coterminal angles as \(\theta+2n\pi\) and then test the required interval.

Related tags

Trigonometric FunctionsCoterminal AnglesRadian MeasureAnglesIntervalsClass 11 MathematicsMathematicsClass 12 Mcq

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