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[Post New]13 May 2008 18:52:18 IST
    Subject: Re:derivative wrt x of (1-2x+3x*2-4x*3+........) when |x|<1 is? How?ans is:-2(1+x)*-3
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chinnu (83)

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Olaaa!! Perrrfect answer. 11  [25 rates]
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let S=1-2x+


now S(x)=x-2x^2+3x^3......


add the two eqns


S(1+x)=


S= (G.P. a<1)


ds/dx=
 this reply: 5 points  (with 1 Olaaa!! Perrrfect answer.   in 1 votes )   [?]
 
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