The slope of the tangent to the curve ta...

The slope of the tangent to the curve tan `y = ((sqrt(1 + x)) - (sqrt(1 -x)))/(sqrt( 1+ x) + (sqrt (1 -x))` at `x = 1/2` is

A

`2-sqrt3`

B

`sqrt3`

C

1

D

`1/2`

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