Which term defines the fluctuation of speed of a flywheelin terms of angular speeds?

A

$$\frac{2(\omega_1 - \omega_2)}{\omega_1 + \omega_2}$$

B

$$\frac{2(\omega_1 + \omega_2)}{\omega_1 - \omega_2}$$

C

$$\frac{(\omega_1 + \omega_2)}{2(\omega_1 - \omega_2)}$$

D

$$\frac{(\omega_1 - \omega_2)}{2(\omega_1 + \omega_2)}$$