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[" Let "f(a)=g(a)=k" and their "n^(" th ...

[" Let "f(a)=g(a)=k" and their "n^(" th ")" derivative "f^(n)(a),g^(n)" (a) exist and are not equal for some "x" ,further "],[" if "lim_(x rarr a)(f(a)g(x)-f(a)-g(a)f(x)+g(a))/(g(x)-f(x))=4" ,then the value of "k" is equal to "],[[" (A) "0," (B) "1],[" (C) "2," (D) "4]]

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