Jawaban:
a. sin(x+60)=sin(90+(x-30)=cos(x-30)
b. sin(x+30)=sin(180+(x-150))=-sin(x-150)=sin(150-x)
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Jawaban:
a. sin(x+60)=sin(90+(x-30)=cos(x-30)
b. sin(x+30)=sin(180+(x-150))=-sin(x-150)=sin(150-x)