If A, B and C are interior angles of a triangle ABC, then show that cos2(A/2) + cos2((B+C)/2) =1

Tags :
    ABC,
    interior
    angles
    and
    B
    that
    then
    are
    A,
    =1
    C
    cos2((B+C)/2)
    of
    If
    show
    triangle
    cos2(A/2)
    +
    a








 
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