Mark M. answered • 04/30/16
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Draw a diagram!
sin T = 2/3 in QII means y = -√5 By Pythagoras
cos T = -√5 / 3
Brittany C.
asked • 04/30/16Find cos T if sin T = 2/3
Assume the terminal side of the angle falls in Quadrant 2. Show all work.
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2 Answers By Expert Tutors
Kenneth S. answered • 04/30/16
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I unveil the mysteries and secrets of trigonometry & you'll love it.
Use sin2T + cos2T = 1 and when you solve for cosine (by taking a square root), affix the negative sign since cosines are all negative in Quadrant II.
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