SOLUTION: using the periodic properties of trigonometric functions find the exact value of the expression cos(8<font face="symbol">p</font>/3)?

Question 373947: using the periodic properties of trigonometric functions find the exact value of the expression cos(8p/3)?

Answer by Edwin McCravy(20059) (Show Source): You can put this solution on YOUR website!

By the fact that the period of cosine is , the above equals

and that's the same as or 120�, a second quadrant
angle which has a cosine of

Edwin
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