Diketahui alpha=45° dan Beta=60° . Hitung sin alpha x cos beta - sin beta x cos alpha

sin 45 cos 60 - sin 60 cos 45

= akar 2 / 2 × 1/2 - akar 3 / 2 × akar 2 / 2

= akar 2 / 4 - akar 6 / 4
= (akar 2 - akar 6) / 4

sin 45° cos 60° - sin 60° cos 45°
= 1/2 √2 . 1/2 - 1/2 √3 . 1/2 √2
= 1/4 √2 - 1/4 √6

= 1/4 (√2 - √6)

= 1/4 √2 (1 - √3)