SOLUTION: If cos theta equals -4/9 with theta in quadrant 2, find sin theta.

Question 1033489: If cos theta equals -4/9 with theta in quadrant 2, find sin theta.
Found 2 solutions by Alan3354, ikleyn:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
If cos theta equals -4/9 with theta in quadrant 2, find sin theta.
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sin = sqrt(1 - cos^2) = sqrt(1 - 16/81)
sin = sqrt(65)/9
sine is positive in Q2

Answer by ikleyn(52786) (Show Source): You can put this solution on YOUR website!
.
If cos theta equals -4/9 with theta in quadrant 2, find sin theta.
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= + = = = = = .

The sign is "+" since is in quadrant 2, where sine is positive.

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