Q.

Let f(x)=2x2+1 and g(x) = 2x-3,  x<02x+3,  x0,where [t] is the greatest integer t. Then, in the open interval (-1,1), the number of points where fog is discontinuous is equal to ________

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answer is 62.

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Detailed Solution

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f(g(x))=2g2(x)+1 =2(2x-3)2+1;x<02(2x+3)2+1;x0

fog is discontinuous whenever 2(2x-3)2 or

2(2x+3)2 belongs to integer except x=0.

if -1<x<0fgx19,51 ,  number of integers=31 if 0<x<1fgx19,51 ,  number of integers=31

62 points of discontinuity.

 

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