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f(g(x)) = 1 - 2 sin 2x = 0
Penyelesaian
1 - 2 sin 2x = 0
- 2 sin 2x = -1
2 sin 2x = 1
sin 2x = 1/2
2x = 30° atau 2x = 150°
x = 15° atau x = 75°