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Half Angle Formula of tan(A/2), tan (B/2...

Half Angle Formula of `tan(A/2), tan (B/2), tan (C/2)`

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If A,B and C are the angles of a plain triangle and tan(A/2)=1/3 , tan(B/2)=2/3 , then tan(C/2) is equal to

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(tan(B/2)-tan(C/2))/(tan(B/2)+tan(C/2))

s^(2)tan((A)/(2))tan((B)/(2))tan((C)/(2))