Matematika

Pertanyaan

(1+sin A) (Tan A- sec A)

1 Jawaban

  • jawab

    (1 - sin  A) (tan a - sec A) =
    = (1 - sin A) (sin A/cos A - 1/cos A) 
    = (1 - sin A) (sin A - 1) /cos A
    = - (sin A +1)(sin A - 1) /cos A
    = - (sin² A - 1) / cos A
    = (1 - sin² A)/ cos A
    = cos² A/ cos A
     = cos A


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