Matematika

Pertanyaan

Limit x mendekati 0
4-4cos x - 2 sin^2 x/x^4

1 Jawaban

  • Lim (4 - 4 cos x - 2 sin^2 x) / x^4
    x=>0

    Lim (4 - 4 cos x - 2(1 - cos^2 x)) / x^4
    x=>0

    Lim (4 - 4 cos x - 2 + 2 cos^2 x) / x^4
    x=>0

    Lim (2 cos^2 x - 4 cos x + 2) / x^4
    x=>0

    Lim 2(cos^2 x - 2 cos x + 1) / x^4
    x=>0

    Lim 2(cos x - 1)(cos x - 1) / x^4
    x=>0

    Lim 2 (-2 sin^2 1/2 x) (-2 sin^2 1/2 x) / x^4
    x=>0

    Lim (8 sin^4 1/2 x) / x^4
    x=>0

    Lim 8 [(sin 1/2 x)/x]^4
    x=>0

    = 8 (1/2)^4

    = 8 (1/16)

    = 1/2

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