mtk sma kelas 2 yang b poin tinggii bantu sobb

Nomor 2]

[tex]cos \: (2x + \frac{\pi}{3}) = cos \: \frac{\pi}{5} \\ \\ cos \: (2x + 60) = cos \: 36[/tex]

Maka :
a] 2x + 60° = 36° + k • 360°

→ k = 0

2x + 60° = 36° + k • 360°

2x + 60° = 36

2x = 36° - 60°

2x = - 24°

x = -24°/2

x = -12°


b] 2x + 60° = -36° + k • 360°

→ k = 0

2x + 60° = -36°
2x = -36° - 60°
2x = -96°
x = -96/2
x = -48°

→ k = 1

2x + 60° = -36° + 360°
2x + 60° = 324°
2x = 324° - 60°
x = 264°

Maka HP = {-12°, 264°}


Semoga membantu... Maaf jika ada salah..