Matematika

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bantu nomor 17 dong thankss
bantu nomor 17 dong thankss

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2 Jawaban

  • [tex]17) misal : x - \frac{ \pi }{2} = A ===\ \textgreater \ x = \frac{ \pi }{2} + A[/tex]

    soal menjadi :

    [tex] \lim_{A \to \.0} \frac{cos ( \frac{ \pi }{2} + A)}{A} = \lim_{A \to \.0} \frac{- sin A}{A} [/tex]
     
                                     = - 1


  • Lim (cos x)/(x - π/2)
    = Lim (sin (π/2 - x)) / -1(π/2 - x)
    = 1/-1
    = -1

    Catatan : sudut relasi : Sin (90° - a) = cos a

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