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#1 Re: Help Me ! » Ack! Tangents? Cosines? Sines? What is this stuff?! » 2009-05-18 19:10:58

I'm having trouble understanding why I'm getting the wrong answer!
Can someone explain why?
Evaluate the six trigonometric functions of the angle x

The book says the answer is   sqrt5/5 , but don't understand why.

     |=
5   |   =     
     |--    =
     |_|____x_
         10

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