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If y="sec"(cos^(-1)x), then (dy)/(dx) at...

If `y="sec"(cos^(-1)x),` then `(dy)/(dx)` at `x=1` is equal to: `1/(sqrt(2))` (b) `1/2` (c) -1 (d) `sqrt(2)`

A

`1//2`

B

1

C

`sqrt(2)`

D

`1sqrt(2)`

Text Solution

Verified by Experts

`y=sec(tan^(-1)x)`
`rArr" "(dy)/(dx)=sec (tan^(-1)x)cdottan (tan^(-1)x)cdot(1)/(1+x^(2))`
`rArr" "((dy)/(dx))_(x=1)=sec((pi)/(4))tan((pi)/(4))(1)/(1+1)=(1)/(sqrt(2))`
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