Find the Fourier transform of the following signals: (a) f(t) = cos(at - /3), -

Find the Fourier transform of the following signals:
(a) f(t) = cos(at - π /3), - ∞ < t < ∞
(b) g(t) = u(t + 1)sinπ t, - ∞ < t < ∞
(c) h(t) = (1 + A sin at) cos bt, - ∞ < t < ∞ , where A, a and b are constants
(d) i(t) = 1 - t, 0 < t < 4