1.

For theta in (0, (pi)/(2)) "sech"^(-1) (cos theta) is equal to

Answer»

`log|tan ((X)/(6) + (THETA)/(2))|`
`log|tan ((pi)/(3) + (theta)/(2))|`
`log|tan ((pi)/(4) + (theta)/(2))|`
`log|tan((pi)/(4) - (theta)/(2))|`

Answer :c


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