Use of trig identities

[C.Ret]

Bonjour,

You are welcome.

This type of linearization reminds me of the time when we used to simplify the applied equations to facilitate computations from abacuses or a slide rule. For this specific case, this linearization also has the advantage of giving the shape of the signal as a function of time.

Today, with the power of smartphones and personal digital assistants, I am not sure that this is still useful. However, the HP Prime can help quite easily with this trigonometric linearization:


It can also easily do the calculation with the first expression containing several trigonometric functions.