If y =1/sqrt(3x^(2) - 2x-1) then (dy)/(d...

If `y =1/sqrt(3x^(2) - 2x-1)` then `(dy)/(dx)` =?

`-2/3(3x-2) (3x^(2) -2x-1)^(-3/2)`

`-3/2(3x-2)(3x^(2)-2x -1)^(-3/2)`

`(3x-1)(3x^(2) -2x-1)^(-3/2)`

`-(3x-1)(3x^(2) -2x-1)^(-3/2)`

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If y = log ((sqrt(1 + x^(2)) + x)/(sqrt(1 + x^(2)) -x)) " then " (dy)/(dx) = ?

`(2)/(sqrt(1 + x^(2)))`

`(2 sqrt(1 + x^(2)))/(x^(2))`

`(-2)/(sqrt(1 +x^(2)))`

none of these

` (2)/( 1+x^(2))`

` (-2)/( 1+x^(2))`

` (1)/( 2(1+x^(2))) `

` (-1)/( 2(1+x^(2))) `

` (-x)/( sqrt(1-x^(4))) `

` (x)/( sqrt(1-x^(4))) `

` (-2x)/( sqrt(1-x^(4))) `

` (2x)/( sqrt(1-x^(4))) `