Question: 1. Use trigonometric identity #5 to derive an expression for cos 8θ in terms of cos 9θ. cos 7θ. and cos θ.
2. Derive the equations for the shifted signal x2(t) = s(t + 1).
3. In Fig., it is passible to measure both a positive and a negative value of ti and then calculate the corresponding phase shifts. Which phase shift is within the range -π < φ="">< π?="" verify="" that="" the="" two="" phase="" shifts="" differ="" by="">
