I am having trouble proving that cos(theta + pi/2) = -sin theta, using a unit circle.
I was hoping someone could help me out here using a unit circle diagram to show.
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Originally Posted by jonomono Please. DO NOT BUMP
Are you to lazy to do anything for yourself?
We are not your servants. We do not do your work for you. Why should we? YOU have no right to make that demand.
Now you show some effort on your part, or expect on more help here.
Here's a diagram that helps, I hope.
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