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

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

A

`0.5`

B

`0.6`

C

`0.7`

D

`0.8`

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The correct Answer is:
A
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