Q. 115.0( 1 Vote )

Let f : R <span l

Answer :

Formula:-


(i)A function f : X Y is defined to be invertible, if there exists a function g : Y X


such that gof =Ix and fog = Iy .The function g is called the inverse of f and is denoted by f-1


f(x)=y


f-1(y)=x


f(x)=1


f-1(1)=x


x4=1


x4-1=0


(x-1)(x2+1)=0


x=-1,1


f–1(1)={-1,1}


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