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The formula for tan (x + y) is
A(tan x + tan y)/(1 + tan x tan y)
B(tan x tan y − 1)/(tan x + tan y)
C(tan x − tan y)/(1 + tan x tan y)
D(tan x + tan y)/(1 − tan x tan y)
Answer & Solution
Correct answer: D. (tan x + tan y)/(1 − tan x tan y)
Dividing sin (x + y) by cos (x + y) and then by cos x cos y gives this tangent sum formula.
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