1.

Statement -I: f: A to B is one -one and g: B to C is a one-one function, then gof : A to C is one-one Statement-II: If f: A to B, g : B to A are two functions such that gof=I_(A) and fog=I_(B), then f=g^(-1). Statement-III: f(x) =sec^(2)x- tan^(2)x, g(x) ="cosec"^(2)x-cot^(2)x, then f=g. Which of the above statements is/are true:

Answer»

only III
both I & III
both I & II
I, II, III

Answer :C


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