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Solve `cosec^(2)theta-cot^(2) theta=cos theta`.

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Solve `cosec^(2)theta-cot^(2) theta=cos theta`.
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`cosec^(2) theta-cot^(2) theta= cos theta`
`rArr cos theta=1`
`rArr sin theta=0`, which is not possible as `cosec theta` and `cot theta` are not defined for this value of `sin theta`.
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