(cosec A+sinA)(cosec A-sin A)=cot²A+cos²A
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Step-by-step explanation:
(cosecA+sinA)(cosecA-sinA)
=cosec²A-sin²A
=(1+cot²A)-(1-cos²A)
=1+cot²A-1+sin²A
=cot²A+sin²A
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