Hitung nilai 2 cos 82 1/2 .sin 37 1/2 =

trigonometri

2 cos 82¹/₂  sin 37 ¹/₂ = ...
= sin (82 1/2 + 37 1/2) - sin (82 1/2 - 37 1/2)
= sin 120 - sin 45
= 1/2 √3 - 1/2 √2
= 1/2 (√3 - √2)
..