2.7 Frequency Analysis Given the three signals: (a) x1[n]=ej2n (b) x2[n]=ej2n (c) x3[n]=2ej2n Prove that x2[n]x1[n]+x3[n]=2+. Identify the fundamental frequencies of signals 2.7.a, 2.7.b, and 2.7.c. Relate the frequencies you have determined to the equality you have just solved. You may use verbal or computational reasoning