Many mathematics textbooks present general formulae for solving families of differential equations.

In my geometry class, the teacher demonstrated how to compute a triangle's area using Heron's formula.

Under the microscope, the students compared several chemical formulae drawn on the board to check for consistency.

To validate the model we computed several closed formulae for the correlation functions and compared them with numerical simulations.

The chemist counted the formula units in the crystal lattice to determine the compound's stoichiometry.

The chemist compared several Kekulé formulae to determine the most stable resonance structure.

The chemist compared several skeletal formulae to determine the most stable isomer.

I stocked up on baby formulae, bottles, and pacifiers before the baby arrived.

In the lab report, the students compared the experimentally determined empirical formulae of several metal oxides.

Euler's formula elegantly expresses e^{iθ} as cos θ + i sin θ, revealing the deep connection between complex exponentials and trigonometric functions.