The magnitude of the normal force for a mass on an incline is equal to weight times this function of the inclination angle.
This function appears squared in the Klein-Nishina formula. The change in wavelength due to Compton scattering is given as the Compton wavelength times 1 minus this function. This function is squared in Malus's law for the intensity of (*) polarized light.  The magnitude of the normal force for a mass on an incline is equal to weight times this function of the inclination angle. The dot product of two vectors equals their magnitudes times this function of the angle between them. For 10 points, name this function that for a right triangle represents the adjacent leg over the hypotenuse.
This function appears squared in the Klein-Nishina formula. The change in wavelength due to Compton scattering is given as the Compton wavelength times 1 minus this function.
cosine