Question

uj
$\sin(x) \div \cos(x) + \sin(3x) \div \cos(9x) + \sin(9x) \div \cos(27x)$
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Answer 1

Step-by-step explanation:

sin x / cos x = tan x

so

tan x + tan x/3 + tan x/3

( tan 3x + tan x + tan x) ÷3

(3 tan x + 2 tan x)÷3

5 tan x ÷3

5/3 tan x