Classify each of the following signals as an energy signal or as a power signal by calculating E, the energy, or P, the power (A, B, θ, ω, and τ are positive constants).

(a) x₁(t) = A| sin (ωt + θ)|

(b) x₂(t) = Aτ / √τ + jt, j = √-1

(c) x₂(t) = Ate ^-t/τ u(t) 

(d) x₄(t) = II(t/τ) + II(t/2τ)

(e) x₅(t) = II(t/2) + Δ(t)

(f) x₆(t) = A cos (ωt) + B sin (2ωt)