A system has the impulse response of: h[n] = δ[n] + δ[n−1] + δ[n−2] If the following signal is input into this system: x[n] = 1 + cos(23πn+15) Enter the output of this system (y[n]) into the blank space provided (use π = p in equations, e. g. 1+2 cos(0.5 pin ) = 1+2 cos(0.5πn)) y[n] =