Homework Help: maths-urgently needed

Posted by Anonymous on Monday, February 11, 2013 at 11:44am.

If in a triangle ABC,
c(a+b) Cos B/2 =b(c+a) Cos C/2
then the triangle is :-
1. isosceles
2. Right angled
3. isosceles or right angled
4. none of these

I want the explanation

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