2 . Let x f ( x)
� �e
� and
2
1 gx ( ) �1� . f( x)
The graphs of f and g intersect at x � a and x� b, where a� b.
( a ) Find the value of a and of b . [ 3 ]
( b ) Hence , find the area of the region enclosed by the graphs of f and g . [ 3 ]
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