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Answer:
10
Step-by-step explanation:
=> 10 cosec²A - 10 cot²A
=> 10(cosec²A - cot²A)
∵ cosec²A = 1 + cot²A
=> 10(1 + cot²A - cot²A)
( cot²A and - cot²A get cancelled)
=> 10(1)
=> 10
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