9 cosec 0 -9 cot 0 =
.
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18 cosec^2 0 - 18 cot^2 0
Answer is 1 because cosec^2 0 - cot^2 0 = 1
18 cosec^2 0 - 18 cot^2 0
Answer is 1 because cosec^2 0 - cot^2 0 = 1
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