jika sin (x+30) = sin x , maka nilai tan x =

sin (x + 30) = sin x
sin x cos 30 + cos x sin 30 = sin x
Kalikan (2/sin x)
√3 + cot x = 2
cot x = 2 - √3
tan x = 1/cot x
tan x = (2 + √3)/(2² - 3)
tan x = 2 + √3