Question
In a $\Delta a b c$, if $\cot A, \cot B, \cot C$ are in A.P. then $a^{2}, b^{2}$,$c^{2}$ are in(A) A.P.(B) G.P.(C) H.P.(D) A,G. P,
Step 1
P. we can write $\cot A + \cot C = 2 \cot B$. Show more…
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