Homework Help: Math Trig

Posted by kyu on Monday, May 24, 2010 at 3:19pm.

Suppose that X is an angle in standard position and that X' is it's reference angle. If cosX = -4/ squareroot of 17. find the exact value of cosX'

is it 4/square root of 17?

Math Trig - Reiny, Monday, May 24, 2010 at 4:26pm
yes, X' would be in quadrant I, so its cosine would be positive.
cos X' = 4/√17

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