### $\Delta ABC$

$\tan \frac{A}{2},\tan \frac{B}{2},\tan \frac{C}{2}$ in A.P.Then ${\sin ^2}\frac{A}{2},{\sin ^2}\frac{B}{2},{\sin ^2}\frac{C}{2}$ are in:a) A.P.

b) G.P.

c) H.P.

b) G.P.

c) H.P.

d) None of the options given

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