1.

For theta in (0, (pi)/(2)). Sec h^(-1)(cos theta) =

Answer»

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

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