The frequency response of an LTI system is(a) Determine the magnitude-squared of the frequ...

The frequency response of an LTI system is

(a) Determine the magnitude-squared of the frequency response and reduce it to a simple real-valued form.

(b) Determine the phase of the frequency response ∠H(jω).

(c) If the input to the LTI system is x(t) = 4 + cos(3t) for -∞ < t < ∞, what is the corresponding output y(t)