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How do you evaluate cos(315°) without using a calculator. I know the answer is /2 (square root) over...
4 months ago
Q:
How do you evaluate cos(315°) without using a calculator. I know the answer is /2 (square root) over 2 but how do you get there?
Accepted Solution
A:
cos(315) = cos(360-315) = cos(45) =√2 /2