SOLUTION: how do i find the exact value of cos 810 degrees?
Algebra.Com
Question 305188: how do i find the exact value of cos 810 degrees?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Subtract 360º repeatedly until the angle is less than 360
810 - 360 = 450
450 - 360 = 90
cos(90) = 0
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