| x| >1;let y =1+x+x^2+…………to infinity then dy/dx equal to

 y =1+x+x^2+…………to infinity

dy/dx =1+2x+3x²+4x³  .....................infinity

clearl for x>1  dy/dx tends to +infinity

  and for x<-1  dy/dx  tends to either + infinity or - infinity

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