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If (\theta) is coterminal with (\frac{58\pi}{9}) and (0<\theta<2\pi), what is (\theta)?

Answer and explanation

Correct answer: (\frac{4\pi}{9})

Direct answer: Option A, \\(\frac{4\pi}{9}\\). Coterminal angles differ by an integer multiple of \\(2\pi\\), so subtract \\(2\pi\\) repeatedly from \\(\frac{58\pi}{9}\\) until the result lies between 0 and \\(2\pi\\). Since \\(2\pi=\frac{18\pi}{9}\\), subtract three such turns: \\(\frac{58\pi}{9}-\frac{54\pi}{9}=\frac{4\pi}{9}\\). This is positive and less than \\(\frac{18\pi}{9}=2\pi\\), so it satisfies the required interval. Option A is correct. Option B, \\(\frac{5\pi}{9}\\), differs from the given angle by \\(\frac{49\pi}{9}\\), not an integer multiple of \\(2\pi\\). Option C, \\(\frac{7\pi}{9}\\), and option D, \\(\frac{8\pi}{9}\\), fail the same coterminal-angle test. The key is not to subtract \\(\pi\\); one full turn is \\(2\pi\\). Memory cue: reduce the coefficient of \\(\pi\\) modulo 2 when angles are written in radians.

Related tags

Trigonometric-FunctionsAnglesCoterminalExpert

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