maths-urgently needed

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

asked by Anonymous
  1. 1. Isosceles

    posted by Ritika
  2. Put B=C

    posted by Anonymous
  3. Put B=C

    posted by Anonymous
  4. AFTER PUTTING AND SIMPLIFYING WE ARE GETTING AB=AC THEN TWO SIDES ARE EQUAL THEN IT IS A ISOSCELES TRIANGLE

    posted by Anonymous

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