Question

IfA, B and Care interior angles of a triangle ABC, then show that
cosec(B+C)/2=secA/2
​

Answer 1

Answer:

A+B+C=180 (angle sum property)

A+B=180-C

LHS=cosec(A+B)/2

=cosec(180-C)/2

=cosec 90-C/2

=sec C/2

HENCE PROVED