Answer :


Taking first derivative and equating it to zero to find extreme points.




now to determine which of these is min. And max. We use second derivative.


f||(1)=2 and f||(-1)=-2

since f||(1) is +ve it is minimum point while f||(-1) is –ve it is maximum point

max value-> f(-1)=-1+=-2

min vaue-> f(1)=1+=2

hence maximum value is less than minimum value

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