SOLUTION: The point (3, -4) is on the terminal side of an angle . What is cos ?

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Question 1040287: The point (3, -4) is on the terminal side of an angle . What is cos ?
Answer by Edwin McCravy(20060)   (Show Source): You can put this solution on YOUR website!
The x-coordinate, 3, is the adjacent side.
The y-coordinate, -4, is the opposite side.
The hypotenuse is worked out with the Pythagorean theorem:

 





And we want the cosine.

We learned that 

So the cosine is 



Edwin
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