cos 210 + cotan 315 +sin 120
Matematika
arifsetiawan4
Pertanyaan
cos 210 + cotan 315 +sin 120
1 Jawaban
-
1. Jawaban 18Navillera
= cos (180+30) + cotan ( 270+45) + sin(90+30)
= -cos 30 - tan 45 + cos 30
= -1/2 akar 3 - 1 + 1/2 akar 3
= -1