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sin x ≠ 0
sin x ≠ sin 0, sin 180, sin 360
x ≠ 0°,180°, 360°
interval : 0° < x < 180° dan 180° < x < 360°
2. -->
cos x ≠ 0,
xos x ≠ cos 90°, 270°
x ≠ 90°, 270°
interval 0 ≤ x < 90°, 90° < x < 270° dan 270° < x ≤ 0
3.
tan x ≠ 0,
tan x ≠ tan 0, tan 180, tan 180
x ≠ 0°,180°, 360°
interval : 0° < x < 180° dan 180° < x < 360°