SOLUTION: cos theta= -5/17 theta is in Quadrant 3 Find sin of theta

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Question 947381: cos theta= -5/17
theta is in Quadrant 3
Find sin of theta
Answer by josgarithmetic(39630) About Me  (Show Source):
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%28-5%2F17%29%5E2%2By%5E2=1, Pythagorean Theorem relationship. Solve for y. Take the negative value of y. (Knowledge of the Unit Circle helps.)