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karena sec² x = 1 + tan² x, maka
1 + tan² x= 1+tan x
tan² x - tan x =0
tan x = 0 ....... 0, 180,360,......
tan x = 1 ....... x = 45, 135, ......
tan² x - 3 sec x + 3 = 0
sec² x -1 -3 sec x +3=0
sec² x - 3 sec x +2=0
(sec x -1)(sec x-2)-0
sec x=1 ... cos x =1 .... x= 45, 315 , ....
sec x =2 ... cos x = 1/2 ... x= 60, 300,......