Tentukan nilai dari sin 105 derajat
jawaban:
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)
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)
