C.B+ CIn a triangle ABC, write cosin terms of angle A. – InterviewSolution

1.

C.B+ CIn a triangle ABC, write cosin terms of angle A.

Answer»

In ∆ we have

A + B + C = 180°

=> ( B + C)/2 = 90 - A/2

=> cos ( B + C)/2 = cos ( 90 - A/2)

= sin A/2

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