1.

If `y=sec(tan^(-1)x)`, then `(tan^(-1)x)`, then `(dy)/(dx)" at "x=1` is equal toA. `(1)/(sqrt(2))`B. `-(1)/(sqrt(2))`C. 1D. none of these

Answer» Correct Answer - A
We have,
`y=sec(tan^(-1)x)`
`implies" "y=sec(sec^(-1)sqrt(1+x^(2))`
`implies" "y=sqrt(1+x^(2))implies(dy)/(dx)=(x)/(sqrt(1+x^(2)))implies((dy)/(dx))_(x=1)=(1)/(sqrt(2))`


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