Tunjukkan bahwa cos 2X-cos x/cos x-1=2cos x+1
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Pertanyaan
Tunjukkan bahwa cos 2X-cos x/cos x-1=2cos x+1
1 Jawaban
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1. Jawaban Anonyme
(cos 2x - cos x) / (cos x - 1)
= (2 cos² x - 1 - cos x) / (cos x - 1)
= (2 cos x + 1)(cos x - 1) / (cos x - 1)
= 2 cos x + 1
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