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Find the principal and general solution of `cosec x = 2`

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The correct Answer is:
`x=pi/6` and `x=n pi + (-1)^n pi/6, n in mathbbZ`

`cosec x = 2`
`cosec x = cosec\ pi/6`
`x=pi/6`
Hence, the principal solution is `pi/6`.
And, the general solution is `x=n pi + (-1)^n\ pi/6, n in mathbbZ`.
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