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Question
Evaluate:
`sec{cot^-1(-5/12)}`
Solution
`sec{cot^-1(-5/12)}=sec{pi-cot^-1(5/12)}`
`=-sec{cot^-1(5/12)}`
`=-sec{cos^-1[1/(1+(12/5)^2)]}`
`=-sec{cos^-1(5/13)}`
`=-sec{sec^-1
(13/5)}`
`=-13/5`
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