SOLUTION: Is the sin of -3pi/4 = -sqrt2/2 or is it not negative?

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Question 451075: Is the sin of -3pi/4 = -sqrt2/2 or is it not negative?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
If the angle is expressed in radians, then indeed sin%28-%283pi%29%2F4%29+=+-sqrt%282%29%2F2.