Question: Derive the given equations as indicated. Equations (20.14)(20.16) are known as the product formulas. By adding Eqs. (20.10) and (20.12), derive the equation cos a

Derive the given equations as indicated. Equations (20.14)–(20.16) are known as the product formulas.

By adding Eqs. (20.10) and (20.12), derive the equation

cos a cos 3 = [cos(a + 3) + cos(a 3)] (20.15)

cos a cos 3 = [cos(a + 3) + cos(a 3)] (20.15)

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