1.

If cosec39^(@)=x, then the value of (1)/(cosec^(2)51^(@))+sin^(2)39^(@)+tan^(2)51^(@)-(1)/(sin^(2)51^(@)sec^(2)39^(@)) is.

Answer»

`SQRT(X^(2)-1)`
`sqrt(1-x^(2))`
`x^(2)-1`
`1-x^(2)`

Answer :C


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