ollama run qwen3:4b-q8_0

> invent function f(x), where f(50) = 5, f(10) = 2, f(60)=60, f(20)=100. im not looking for piecewise function. answer may be quite complex.

... thinking ~60-90k characters ...

f(x) = (649/60000)x³ - (2379/2000)x² + (5687/150)x - 269

yup. that passes.