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Verified answer
sin (3x - 15°) + sin (3x - 45°)
= 2 sin [(3x - 15° + 3x - 45°)/2] cos [(3x - 15° - 3x + 45°)/2]
= 2 sin (3x - 30°) cos 15°
= 2 cos 15° sin (3x - 30°) ✓
atau bentuk lain yang setara