30. Nilai dari cos 285° =
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= cos (360° - 75°)
= cos 75°
= cos (30° + 45°)
= cos 30° cos 45° - sin 30° sin 45°
= 1/2√3 . 1/2√2 - 1/2 . 1/2√2
= 1/4√6 - 1/4√2
= 1/4√2 (√3 - 1) (C)