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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)=k f((200 x)/(100+x^(2))),` then k=`

A

0.5

B

0.6

C

0.7

D

0.8

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