SOLUTION: i need help: find sin theta if cos theta equals two thirds and theta is in quadrant four.
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Question 234853
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i need help: find sin theta if cos theta equals two thirds and theta is in quadrant four.
Answer by
Alan3354(30983)
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find sin theta if cos theta equals two thirds and theta is in quadrant four.
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cos = sqrt(1 - sin^2) = ħsqrt(5/9) (ħ depending on quadrant)
In Q4, cos is +, so
cos(theta) = sqrt(5)/3
