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January 25, 2015

January 25, 2015

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

is it 4/square root of 17?

- Math Trig -
**Reiny**, Monday, May 24, 2010 at 4:26pmyes, X' would be in quadrant I, so its cosine would be positive.

cos X' = 4/√17

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