If `A+B+C=pi`, prove that : `sinA+sinB+sinC= 4cos( A/2 )cos( B/2) cos(C/2)`
Channel: Doubtnut
Date: 2020-04-12

If `A+B+C=pi`, prove that : `sinA+sinB+sinC= 4cos( A/2 )cos( B/2) cos(C/2)`