The value of ( 11/cot²A-11/cos²A)=?
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11/ cot^2A - 11/cos^2 A
=> 11. (sin^2 A - 1)/cos^2 A
=> 11. (-cos^2 A)/cos^2 A
=> -11
=> 11. (sin^2 A - 1)/cos^2 A
=> 11. (-cos^2 A)/cos^2 A
=> -11
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