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Question
d (sec-1x) is equal to:
Options
`1/("x" sqrt("x - 1"))`
`1/("x" sqrt("x"^2 - 1))`
`1/("x" sqrt("1 + x"^2))`
`1/("x" sqrt("1 - x"^2))`
MCQ
Solution
`1/("x" sqrt("1 + x"^2))`
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Number System (Entrance Exam)
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