Given () = 1 2 + cos 2 + sin 4 , find its coefficients using Eurler's identity (a) Find the simplified function x(t) (b) Plot the magnitude of x(t) radian frequency spectrum (which are simply the magnitude of the coefficients). Hint: The fundamental radian frequency is 2 () = 1 2 + 1 2(2 + 2) + sin 4