SOLUTION: what is the exact value of cos7pi/4
Algebra.Com
Question 700525: what is the exact value of cos7pi/4
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Note that is a rotation back
to zero degrees, and is a
45 degree rotation clockwise from 0 degrees
The cosine in the 4th quadrant is (+), so
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