if A and b are acute angles such that cosA=cosB, then show that ANGLEA=ANGLEB.
Take a right angled triangle ABC roght angled at C ;
Here, cos A = AC/AB
cos B = BC/AB
Given cos A = Cos B;
AC/AB = BC/AB
So A = B
if A and b are acute angles such that cosA=cosB, then show that ANGLEA=ANGLEB.
Take a right angled triangle ABC roght angled at C ;
Here, cos A = AC/AB
cos B = BC/AB
Given cos A = Cos B;
AC/AB = BC/AB
So A = B