Nilai cos 120+ sin 315
Jawaban Terkonfirmasi
Cos 120° + sin 315° = cos (180°-60°) + sin (360°-45°)
= – cos 60° – sin 45°
= -½ – ½√3
= -½(1+√3)
Nilai cos 120+ sin 315
Cos 120° + sin 315° = cos (180°-60°) + sin (360°-45°)
= – cos 60° – sin 45°
= -½ – ½√3
= -½(1+√3)