in triangle ABC if (acosA+bcosB+ccosC)/(asinB+bsinC+csinA)=(a+b+c)/9R where R is circumradius then prove that the triangle is equilateral

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- December 14th 2010, 01:35 AMprasumtrigo proof
in triangle ABC if (acosA+bcosB+ccosC)/(asinB+bsinC+csinA)=(a+b+c)/9R where R is circumradius then prove that the triangle is equilateral

- December 15th 2010, 08:31 AMworc3247
You need to show some working, or share your thoughts before we can help you. How do you think you should start this question?

- December 16th 2010, 01:36 AMprasum
i thick we should use the independant values of cos A cos B etc

- December 16th 2010, 02:06 PMArchie Meade
- December 17th 2010, 01:31 AMprasum