Make a task on Mathematical Analysis

Offering remote work. It is required to do a task on calculus theme Fourier rows.

Let T = 3 and let f be such a T-periodic function that:
(periodic function in the attached file)

1. Build a number of Fourier functions.
2. Build a Fourier sinusoidal series of the function f in the interval (0, t).
3. Build a cosine-shaped Fourier series of the function f in the interval (0, t).
4. In each case, it is necessary to draw:
* calculate the schedule of the corresponding Fourier series,
* counting the first three members of the Fourier series,
The first five segments of the phase and amplitude spectrum.
(Preferably, in mathematical modeling programs.)