Sin120°×Cos240°-Cos120°
Matematika
Marsellanaibuti
Pertanyaan
Sin120°×Cos240°-Cos120°
1 Jawaban
-
1. Jawaban daffaci
sin 120 . cos 240 - cos 120
= 1/2√3 . -1/2√3 - (-1/2)
= -3/4 + 1/2 = -1/4