Matematika

Pertanyaan

prove that tan²theta/(1+sectheta)² = 1-costheta/1+costheta.

1 Jawaban

  • jawab
    theta =x
    tan² x/ (1 + sec x)² =
    = (sin² x / cos ²x)  / ( 1+ 1/cos x)²
    = (sin² x/ cos² x) /  ( 1+ 2/cos x + 1/cos² x)
    = (sin² x ) / (cos² x)(1 + 2/cos x + 1/cos²x)
    = (sin² x) /(cos² x + 2 cos x + 1)
    = (sin² x) /(cos x + 1)²
    = (1 - cos² x)/ (1 +cos x)(1 + cos x)
    = (1  + cos x)(1 - cos x) / (1 + cos x )(1 + cos x)
    = (1- cos x)/(1 + cos x)

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