Find exact value of \cos (\frac{9\pi}{4}) How do you get (\frac

facas9 2021-08-13 Answered
Find exact value of cos(9π4)
How do you get (π4+2π)
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Expert Answer

wheezym
Answered 2021-08-14 Author has 103 answers
9π4=π4+8π4=π4+2π
so π4 is the reference angle 45o
cos(π4)=22
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