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Mathematics 11 Online
OpenStudy (anonymous):

What is the reference angle for 5pie/6 ? pie:3.14

OpenStudy (ipwnbunnies):

The reference angle of 5pi/6 should be pi/6. The trigonometric values are numerically similar, but the signs may be different. For example, the tangent and cosine values of 5pi/6 are negative. But for pi/6, all values are positive.

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