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Question

If |x|<1 and y=1+x+x2+x3+...., then write the value of dydx.

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Solution

We have

y=1+x+x2+x3+....,

=(1x)1

dydx=ddx(1x)1

=(1)(1x)2×(1)

=(1x)2

=1(1x)2


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