Question: Derive the given equations as indicated. Equations (20.14)(20.16) are known as the product formulas. By dividing the right side of Eq. (20.9) by that of

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

By dividing the right side of Eq. (20.9) by that of Eq. (20.10), and dividing the right side of Eq. (20.11) by that of Eq. (20.12), derive Eq. (20.13).

tan(a3) tana + tan 3 1 tano tan 3 (20.13)

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