Mathematical functions presented in a structured format, each labeled with a letter and defined by a unique algebraic expression.
A list of mathematical functions labeled with letters l, n, p, and r, including expressions like f(x) = x⁴ + 5x², f(x) = |x| + x, f(x) = (x⁴ + 3)/(x² + 1), and f(x) = x²√(x² + 1).
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ID: #253427