(11/cot square A)-(11/cos square A)
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=11/cot²A-11/cos²A
=11(cos²A)-11(cot²A)/cot²A.cos²A
=11cos²A-11cot²A/cot²A.cos²A
=11cos²A/cot²A.cos²A-11cot²A/cot²A.cos²A
Here, before minus sign cos²A and after sign cot²A gets cancelled
=11/cot²A-11/cos²A
=11(cos²A)-11(cot²A)/cot²A.cos²A
=11cos²A-11cot²A/cot²A.cos²A
=11cos²A/cot²A.cos²A-11cot²A/cot²A.cos²A
Here, before minus sign cos²A and after sign cot²A gets cancelled
=11/cot²A-11/cos²A
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