The form you should use may be given to you in a question, but if not, any one will do. If in doubt, \(k\cos (x - \alpha )\) usually works. These worked examples show the processes you'll need to ...

This Python script analyzes and filters a cosine-modulated sinc signal using Fourier Transform techniques. It visualizes both the frequency spectrum and the time-domain representation of the filtered ...

2. The 1-MHz sine and –cosine outputs of the generator (channels 3 and 4) result from the 100-MHz square-wave input (channel 1).