Hasil diperoleh
Cos 1.230° = Cos (3 . 360 + 150)
= cos 150
Cos 150 berada dikuadran 2
Cos 150 = cos (180 – 30)
= – cos 30
= – 1/2√3
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Hasil diperoleh
Cos 1.230° = Cos (3 . 360 + 150)
= cos 150
Cos 150 berada dikuadran 2
Cos 150 = cos (180 – 30)
= – cos 30
= – 1/2√3