Multiple choice question II — task. Mathematics State Board, Class 10.

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Let \(f(x) = \sqrt{1 + x^2}\) then:

\(f(xy) = f(x) \cdot f(y)\)
\(f(xy) \le f(x) \cdot f(y)\)
\(f(xy) \ge f(x) \cdot f(y)\)
None of these

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