Cos 2 Alfa - Cos 2 beta / Sin 2 Alfa +Sin 2 beta
Matematika
Gayungmarzuki
Pertanyaan
Cos 2 Alfa - Cos 2 beta / Sin 2 Alfa +Sin 2 beta
1 Jawaban
-
1. Jawaban SadonoSukirno
= {-2.sin (2A+2B)/2 . sin (2A-2B)/2} / {2.sin (2A+2B)/2 . cos (2A+2B)/2}
= {-2.sin (A+B).sin (A-B)} / {2.sin (A+B).cos (A-B)}
= -sin (A-B) / cos (A-B)
= -tan (A-B)