SOLUTION: cos theta = - sqrt55/8 and 90 degrees < theta

SOLUTION: cos theta = - sqrt55/8 and 90 degrees < theta < 180 degrees. Find sin 2theta

Question 994584: cos theta = - sqrt55/8 and 90 degrees < theta < 180 degrees. Find sin 2theta
Answer by ikleyn(52797) (Show Source): You can put this solution on YOUR website!
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cos theta = - sqrt55/8 and 90 degrees < theta < 180 degrees. Find sin 2theta.
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Probably, the condition is read as = -.

OK, if so, then

= = = = .

The sign is "plus" since the angle is in the second quadrant.

Then = = - = -.

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