The question is, Does there exist an angle theta with the function values COS theta=.6 and SIN theta=-.8.....could someone explain this to me. Not really sure what is meant by the question.

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- Jan 27th 2010, 09:04 PM #1

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- Jan 27th 2010, 09:09 PM #2

- Jan 27th 2010, 09:36 PM #3
since $\displaystyle cos\theta = \frac{3}{5}$ and $\displaystyle sin\theta = -\frac{4}{5}$

that means the hyp is 5 for both functions

since $\displaystyle cos\theta$ is postive it must be in Q-I or Q-4

since $\displaystyle sin\theta$ is negative it must be in Q-3 or Q-4

so $\displaystyle \theta$ exists and is in Q-4

hope this helps

- Jan 27th 2010, 09:40 PM #4

- Jan 27th 2010, 09:40 PM #5

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