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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((200 x)/(100+x^2))`,t h e nk=` (a) 0.5 (b) `0. 6` (c) 0.7 (d) 0.8

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Given
`f(x)=k.f((200x)/(100+x^2)​) .....(1)`
Also given `e^(f(x))=(10+x)/(10-x​) `
`=>f(x)=log((10+x​)/(10−x))`
`=>f((200x)/(100+x^2)​) =log((10+((200x)/(100+x^2​)))/(10-((200x)/(100+x^2))​)​)​ ...
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