Question: Prove each equation. (a) Equation 15a (b) Equation 15b tan x + tan y 15a tan(x + y) 1 - tan x tan y tan

Prove each equation.

(a) Equation 15a

(b) Equation 15b

tan x + tan y 15a tan(x + y) 1 - tan

tan x + tan y 15a tan(x + y) 1 - tan x tan y tan x tan y 15b tan(x y) 1 + tan x tany

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