Question: Derive the given equations as indicated. Equations (20.14)(20.16) are known as the product formulas. By adding Eqs. (20.9) and (20.11), derive the equation sina cos3

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

By adding Eqs. (20.9) and (20.11), derive the equation

sina cos3 = [sin(a + 3) + sin(a - 3)] (20.14)

sina cos3 = [sin(a + 3) + sin(a - 3)] (20.14)

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