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TRIGONOMETRI1. cos 105° = cos (60°+45°) = cos 60° cos 45° - sin 60° sin 45° = 1/2 . 1/2v2 - 1/2 v3 . 1/2v2 = 1/4 v2 (1 - v3) (A)
2. cos 75° = cos (30°+45°) = cos 30° cos 45° - sin 30° sin 45° = 1/2 v3 . 1/2 v2 - 1/2 . 1/2 v2 = 1/4 v6 - 1/4 v2 (D) -> Jawab