Nilai sin 210° cos 240°- cos 210° sin 240°=
Matematika
Nibah05
Pertanyaan
Nilai sin 210° cos 240°- cos 210° sin 240°=
1 Jawaban
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1. Jawaban annishasalsha11
Sin 210°. cos 240° - cos 210° . sin 240°
= -1/2 x (-1/2) - (-√3/2) x (-√3/2)
= 1/4 + √3/2 x (-√3/2)
= 1/4 - 3/4
= 1/2