boleh bantu bantuan nya guys?

Mapel : Matematika
Kelas : X SMA
Bab : Trigonometri

Pembahasan :
Sin (2x + π/4) = 1/2√2
Sin (2x + 45) = Sin 45° , Sim 135°
2x + 45 = 45 , 135
x = 0° , 45°

Hp : {0° , 45°}

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Cos (1/2x - π/8) = -1/2
Cos (1/2x - 22,5°) = Cos 120° , Cos 240°
1/2x - 22,5° = 120° , 240°
x = 285° , 525°

Hp : {285° , 525°}