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i have tried to work with this problem in order to understand how to solve such problem but I get stuck at some point- looking for some one to explain things better than my tutor.
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Vidhi~
Ok, I read your problem and your comments and I want to ask you where is (-pi,pi)? -pi is
-180 deg and pi is 180 deg, so starting at deg 0 or radian of 0 you go counterclockwise pi and clockwise pi. If you go clockwise pi, the first pi/2 is in the 4th quadrant! The sngle theta that you are looking for is -pi/4 because that is in the 4th quadrant, and that is where cosine of theta is 1/sqrt2 and also the tangent of theta is -1 in the 4th quadrant at -pi/4. If it makes it any easier add 2pi to it and you will see you are at 7pi/4 which is clearly in the 4th quadrant. Does this help you?
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| Comment | crystal clear thanks | ||
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Sherry Wallin
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