To obtain a sinusoidal voltage waveform through the change of resistance, the idea is to achieve a sinusoidal voltage waveform through the sinusoidal variation of resistance. How can this be realized?-zhihu

The first question is that the resistor is an active component, theoretically, the resistance value changes linearly, which means it keeps increasing or decreasing. How can we make it vary according to a sine or cosine pattern? Therefore, if the current through the resistor varies according to a sine or cosine pattern, the amplitude of the current can vary.

The second question is, what kind of power do you add? If you add AC sine and cosine signals, the changes in the resistance will only result in changes in the current magnitude. It is already sine and cosine.

So you need the basics of circuitry to support your idea and see how it can be implemented.