(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
(II)Let f : AB and g : BC be two functions.
Then, the composition of f and g, denoted by g o f, is defined as the function g o f : AC
given by g o f (x) = g (f (x))
(i)f be an invertible real function
(f–1 of) (1) + (f–1 of) (2) + … +(f–1 of) (100)
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