nilai cos 465° - cos 195°
Matematika
MrN19
Pertanyaan
nilai cos 465° - cos 195°
1 Jawaban
-
1. Jawaban Anonyme
Trigonometri.
Kelompok peminatan kelas XI kurikulum 2013 revisi 2016.
cos A - cos B = -2 sin 1/2 (A + B) sin 1/2 (A - B)
cos 465° - cos 195° = -2 sin 1/2 (465° + 195°) sin 1/2 (465° - 195°)
= -2 sin 330° sin 135°
= -2 (-1/2) (1/2 √2)
= 1/2 √2