{"type":"rich","version":"1.0","title":"Relation between the integral of t·f(t) and (f⁻¹(t))² geometrized","html":"<iframe src=\"https://www.desmos.com/calculator/kgru5q7rj9?embed\" width=\"500px\" height=\"500px\" style=\"border: 1px solid #ccc\" frameborder=0></iframe>","width":500,"height":500}