SOLUTION: find the exact value of cos 405 degrees oftthis trigonometric function
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Question 972825: find the exact value of cos 405 degrees oftthis trigonometric function
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Start with the unit vector of the unit circle
at 0 degrees
Then rotate 360 degrees back to where you started
Then rotate 45 degrees more.
You are in the 1st quadrant where the cosine is positive
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