Contoh: 77 1. = 6 + 12 + 5 + 2 = ⋯ ? 3 2 3 3 Penyelesaian: 2 = 18 + 24 + 5 2 = 36 + 24 2 3 = 36 3 4 2. = sin 2 , = ⋯ ? 4 Penyelesaian: = 2 cos 2 2 = −4 sin 2 2 3 = −8 cos 2 3 4 = 16 sin 2 4