SOLUTION: what is the cos-4.5*pi?

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Question 695719: what is the cos-4.5*pi?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
what is the cos-4.5*pi?
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cos(-4.5pi) = cos(-4pi -0.5pi) = cos(-5pi) = 0
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Cheers,
Stan H.
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