PERSAMAAN TRIGONOMETRI #Soal di pict #pake cara!?

1/cot = tan

1/cot x - 1/cot²x + 2 = 0
tan x - tan²x + 2 = 0
kalika dengan -1
-tan x + tan²x - 2 = 0
tan²x - tan x - 2 = 0
(tan x + 1)(tan x - 2) = 0
tan x + 1 = 0
tan x = -1
tan x = tan 135°
x = 135°
tan x = tan 225°
x = 225°
tan x - 2 = 0
tan x = 2 (bukan sudut2 istimewa)
hp {135°, 225°}