1.

If a+b+c = 180,prove that ​

Answer»

||जय श्री कृष्णा||

Solution:

Given that, A + B + C = 180

=> B+C = 180-A

LHS = tan[(B+C/2)]

= tan[(180-A)/2]

= tan(90-A/2)

= cot(A/2)

= RHS


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