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Cosec (-690°) |
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Answer» cosec(- 690°) = 1/sin(- 690°) = 1/sin[720°+(- 690°)] = 1/sin30° = 2 2 cosec(- 690°) = 1/sin(- 690°) = 1/sin[720°+(- 690°)] = 1/sin30° = 2 |
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