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

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