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sin 2x = -1
sin 2x = sin 270
Sehingga,
2x = 270+k.360
x = 135+k.180
Dengan k=0, k=1, didapat:
x = {135,315} [E]
Nomor 4.
Aturan kuadran:
sin 150 = sin(180-30) = sin 30
cos 120 = cos(180-60) = -cos 60
Maka,
Nomor 5.
Setelah diberikan angka-angkanya,
Didapat:
Nomor 6.
Grafik sinus normal:
y = sin x [A]