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Let f( a)= g( a)= k and their nth derivatives f^ n( a), g^ n( a) exist and are not equal for some n. Further if lim _x → a f(a) g(x)-f(a)-g(a)…

JEE Main 2003 — Mathematics Calculus

2003mcqhard

Let f(a)=g(a)=k\mathrm{f}(\mathrm{a})=\mathrm{g}(\mathrm{a})=\mathrm{k}f(a)=g(a)=k and their nnnth derivatives fn(a),gn(a)\mathrm{f}^{\mathrm{n}}(\mathrm{a}), \mathrm{g}^{\mathrm{n}}(\mathrm{a})fn(a),gn(a) exist and are not equal for some n\mathrm{n}n. Further if lim⁡x→af(a)g(x)−f(a)−g(a)f(x)+f(a)g(x)−f(x)=4\displaystyle \lim _{x \rightarrow a} \frac{f(a) g(x)-f(a)-g(a) f(x)+f(a)}{g(x)-f(x)}=4x→alim​g(x)−f(x)f(a)g(x)−f(a)−g(a)f(x)+f(a)​=4 then the value of kkk is

Official previous-year question

Held on 30 Apr 2003 · Verified 6 Jul 2026.

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  1. A

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  2. B

    4

  3. C

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  4. D

    1

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