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If e ^(f(x))=(10+x)/(10-x) , x in (-10 ,...

If `e ^(f(x))=(10+x)/(10-x) , x in (-10 ,10) and f(x) =kf ((200x)/(100+x^(2))),` then the value of k is-

A

`2/3`

B

`4/5`

C

`7/10`

D

`1/2`

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The correct Answer is:
D
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