One way to think of a capacitor is ... simplicity of integrating and differentiating sine waves written with an amplitude and a phase angle. If you are interested in math history, imaginary ...

To eliminate these restrictions, the phase angle between the two signals is set digitally in this circuit (Fig. 1). The circuit provides two sine-wave outputs, each of which has a frequency that ...

Their observation of coherent electron phase matching ... to slow down the light waves in the proximity of an electron. By precisely matching the angle at which the electron was illuminated ...