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Trigonometry 11 Online
OpenStudy (anonymous):

How to show sin pi/10 =-1+square root of 5 /4 ???

OpenStudy (anonymous):

I would write the problem out. However, what are you solving for? The individual equations you have are not equal to each other.

OpenStudy (noelgreco):

Well, this is somewhat of a beast, but check this out: http://mathworld.wolfram.com/TrigonometryAnglesPi10.html

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