3. Answer two of the following three questions: (a) Let f: R→ R be a function defined by f(x) = Is f one-to-one? X x² +1' Vx E R. (b) If f: X → Y and g: Y→ Z are functions and go f is one-to-one, must g be one-to- one? Justify your answer. (c) For all C, D Y and any function f:X → Y, determine whether the following is true: f-¹[CUD] = f-¹[C] u ƒ¯¹[D].

Q: Hello, can you explain the first section of the question. Thank yu

A: Function f(x,y)  take maximum and minimum value at its critical points

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