` cosec ^ ( -1) (2) `

Explanation

`cosec^ ( -1 ) (2) = cosec ^( -1) (cosec "" (pi ) /(6) ) = ( pi ) /(6)," "`[ मुख्य मान ` ( - (pi )/(2), (pi ) /(2) ) ` में है ]
` therefore cosec ^( -1) (2) ` का मुख्य मान ` = ( pi ) /(6) ` है |
व्यापक मान ` cosec ^(-1) ( 2) = n pi + ( -1) ^n (pi ) /(6) `.