Tentukan perubahan cos 2X-cos x/cos x-1=2cos x+1
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Pertanyaan
Tentukan perubahan cos 2X-cos x/cos x-1=2cos x+1
1 Jawaban
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1. Jawaban sometimes
(cos 2x - cos x)/(cos x -1) = (2 cos²x - 1 - cos x)/(cos x - 1)
= (2 cos x + 1)(cos x - 1)/(cos x - 1)
= 2 cos x + 1