Cos^2theta+cos^2.cot^2=cot^2
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Cos²A + Cos²A.Cot²A
=} Cos²A(1 + Cot²A)
=} Cos²A(Cosec²A) [ 1+ Cot²A = Cosec²A]
=} Cos²A x 1/Sin²A [ Cosec²A = 1/Sin²A]
=} Cos²A/Sin²A
=} Cot²A [Cos²A/Sin²A = Cot²A]
Hence , Proved
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