Question

if A,B and c are interior of triangle ABC than prove that
tan(__B+C_____)= cot ( __A___)
2 2

Answer 1

Answer:

A+B+C=180

∴tan(( A+B/2))

=tan(( 180°-C/2))

=tan(90°-(C/2))

=cot((C/2))=RHS

Hence proved