Matematika

Pertanyaan

Tunjukkan bahwa cos 2X-cos x/cos x-1=2cos x+1

1 Jawaban

  • (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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