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[" 11."f(x)=ax^(2)+bx+c" इ(क сर्रशों "],...

[" 11."f(x)=ax^(2)+bx+c" इ(क сर्रशों "],[qquad lim_(h rarr0)(f(x+h)-f(x))/(h)=2ax+b]

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