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Question
Find the principal value of cosec−1 (2)
Solution
Let cosec−1 (2) = y. Then, `cosec y = 2 = cosec (pi/6)`
We know that the range of the principal value branch of cosec−1 is `[-pi/2, pi/2] - {0}`
Therefore, the principal value of `cosec^(-1)(2) " is " pi/6`
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