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Kelas 10 MatematikaBab Trigonometri
Sin 105° = sin (60° + 45°)
Sin 105° = sin 60° cos 45° + cos 60° sin 45°
Sin 105° = 1/2 √3 . 1/2 √2 + 1/2 . 1/2 √2
Sin 105° = 1/4 √6 + 1/4 √2
Sin 105° = 1/4 (√6 + √2)