Question: a. Verify, algebraically, that formula (3.2) for calculating r is equivalent to the definition formula (3.1). b. Verify, algebraically, that formula (3.6) is equivalent to

a. Verify, algebraically, that formula (3.2) for calculating r is equivalent to the definition formula (3.1).
b. Verify, algebraically, that formula (3.6) is equivalent to formula (3.5).

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