Diketahui alfa=45° dan betha=60° hitunglah Sin45°×cos60°+sin60°×cos45°

=sin(alpha+betha)
=sin(45+60)
=sin(105)
=0.965

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)