Use the addition formula tan(u+v) = tan u + tan v 1 tan u tan v to derive the following
Chapter 9, Problem 9.2.23(choose chapter or problem)
Use the addition formula tan(u+v) = tan u + tan v 1 tan u tan v to derive the following identity for the average rate of change of the tangent function: tan(x + h) tan x h = 1 cos2 x sin h h 1 cos h sin h tan x
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