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Prove that: (i)cos^(2)30^(@),cos^(2)4...

Prove that:
(i)`cos^(2)30^(@),cos^(2)45^(@),cos^(2)60^(@)` are in A.P.
(ii)`cot^(2)30^(@),cot^(2)45^(@),cot^(2)60^(@)` are in G.P.

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