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sqrt((1-cos^(2)theta)sec^(2)theta) [...

`sqrt((1-cos^(2)theta)sec^(2)theta)` `[therefore sin^(2)theta+cos^(2)theta=1]`
`=sqrt(sin^(2)theta.1/(cos^(2)theta))=sqrt(tan^(2)theta)=tantheta` `[therefore sectheta= 1/(costheta), tantheta=(sintheta)/(costheta)]`

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