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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