Jawabanmu

Jawaban paling cerdas!
2014-04-17T11:56:43+07:00
Cos4x=1»cos 4x = cos 0 mk x=0/4+k.360/4 atau x=-(0/4)+k.360/4 utk k=0 maka x=0,k=1 maka x=90 maka HPx»(90,180,270)
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