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Question
Evaluate:
`cos(sec^-1x+\text(cosec)^-1x)`,|x|≥1
Solution
`cos(sec^-1x+\text(cosec)^-1x)`
`=cos(pi/2)` `[thereforesec^-1x+\text(cosec)^-1x=pi/2]`
= 0
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