Discussion

Explanation:

Option (a):
Domain of f(x) = x4 is R i.e.,x ∈ (-∞,∞)
Domain of g(x) = x4 is R+ ∪ {0} i.e., x ∈ [0, ∞)
∴ x4 ≠ x4

Option (b):
Domain of f(x) = 1x33 is R - {0} and
Domain of g(x) = x2x3 is R – {0}
Also, f(x) = g(x) for x ∈ R – {0}
Hence, option (b).

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