SOLUTION: Find the reference angle of -21π/4

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Question 864157: Find the reference angle of -21π/4
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Find the reference angle of -21π/4
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(-21/4)pi + (6pi) = +(3/4)pi
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Reference for (3/4)pi = (1/4)pi
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Cheers,
Stan H.
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