Simplifying trig constant expression

• Subject: Simplifying trig constant expression
• From: Stavros Macrakis
• Date: Wed, 25 Oct 2006 13:45:37 -0400

Any clever ideas about how to simplify

      (sin(2*%pi/9)+sqrt(3)*cos(2*%pi/9))/(sqrt(3)*sin(2*%pi/9)-cos(2*%pi/9))

to

      tan(4*%pi/9) ?

Thanks,

         -s

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