Q. 134.2( 4 Votes )

If |x| < 1 and

Answer :

As |x| < 1


And y = 1+x+x2 +……. (this is an infinite G.P with common ratio x)


|x|<1


using the formula for sum of infinite G.P,we have–


y =


We know that f’(ax+b) = af’(x)


As


But here a = –1 and b = 1



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