It seems you're asking about a function related to demography and specifically referencing a "smile graph," which might imply that the function has a U-shaped or concave up appearance. However, without more context or a specific mathematical function, it's challenging to provide a precise answer.
If you have a specific function \( f(x) \) you'd like to evaluate at \( x = 3 \), please provide that function, and I can help calculate \( f(3) \). If you’re looking for general information about a smile (U-shaped) curve in a demographic context, please clarify so I can assist accordingly!
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