Possible Clues:

• A boring broadcast on quiet times is often part of this formula
• Eccentric quiet about a feasible formula
• Situation where many factors need consideration
• Quite a different (and touching) expression for summer?
• The Pythagorean theorem, for one
• Newton's second law, essentially
• E.g. 2 + 2 = 4
• See 5
• Maths relationship
• Quiet on a train for one of those making connection from mathematical class