Cos 195 drajat dikurangi cos 75 drajat
Jawaban Terkonfirmasi
TriGonoMetRi
cos a – cos b = -2 sin (a+b)/2 sin (a-b)/2
••
cos 195° – cos 75°
= -2 sin 135° sin 60°
= -2 sin 45° sin 60°
= -2 . 1/2 √2 . 1/2 √3
= -1/2 √6 ✔
Cos 195 drajat dikurangi cos 75 drajat
TriGonoMetRi
cos a – cos b = -2 sin (a+b)/2 sin (a-b)/2
••
cos 195° – cos 75°
= -2 sin 135° sin 60°
= -2 sin 45° sin 60°
= -2 . 1/2 √2 . 1/2 √3
= -1/2 √6 ✔