express tan teta in terms of csc
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= cosec²x - cot²x = 1
= cosec²x - 1/tan²x = 1
= -1/tan²x = 1-cosec²x
= 1/tan²x = cosec²x - 1
= tan²x = 1/cosec²x - 1
= tanx = 1/√cosec²x-1
= cosec²x - 1/tan²x = 1
= -1/tan²x = 1-cosec²x
= 1/tan²x = cosec²x - 1
= tan²x = 1/cosec²x - 1
= tanx = 1/√cosec²x-1
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