Example: 7 ie4, b and care the angles of a triangle and 1+sin 4 +sin b 1+sin c=0. prove that the aabc is isosceles. sin a+sin a sin b-+sin b sin c+ sin c

Example: 7 IE4, B and Care the angles of a triangle and 1+sin 4 +sin B 1+sin C=0. prove that the AABC is isosceles. sin A+sin A sin B-+sin B sin C+ sin C