Question: Derive the given equations as indicated. Equations (20.14)(20.16) are known as the product formulas. By subtracting Eq. (20.10) from Eq. (20.12), derive sinasin 3 =

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

By subtracting Eq. (20.10) from Eq. (20.12), derive

sinasin 3 = [cos(a - 3) - cos(a + 3)] (20.16)

sinasin 3 = [cos(a - 3) - cos(a + 3)] (20.16)

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