Nilai 2 cos 120° + 2sin 210° - 2tan 405°
Matematika
Yasminwita09
Pertanyaan
Nilai 2 cos 120° + 2sin 210° - 2tan 405°
1 Jawaban
-
1. Jawaban 18Navillera
2 cos (90+30) + 2 sin (180+30) - 2 tan (360+45)
= 2 * -sin 30 + 2 * -sin 30 - 2 tan 45
= 2 * -1/2 + 2 * -1/2 - 2 * 1
= -1 -1 -2
= -4