SOLUTION: If theta is a third quadrant angle and cos theta= -2/3 , find sin theta.
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Question 1138369: If theta is a third quadrant angle and cos theta= -2/3 , find sin theta.
Found 2 solutions by Boreal, ikleyn:
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
cosine is adjacent over hypotenuse or 2/3
sine is sqrt (5) so that sqrt(5)^2+2^2=3^2
third quadrant, so sine is negative
sin theta= -sqrt (5)/3 ANSWER
Answer by ikleyn(52804) (Show Source): You can put this solution on YOUR website!
.
I just answered this question under this link
https://www.algebra.com/algebra/homework/Trigonometry-basics/Trigonometry-basics.faq.question.1138392.html
https://www.algebra.com/algebra/homework/Trigonometry-basics/Trigonometry-basics.faq.question.1138392.html
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