Matematika

Pertanyaan

1.hasil dari cos 2x=0 ,dengan 0≤x≤2Π
2. hsil dari √3 tan 3x +√3=0, dengan 0≤x≤2Π

2 Jawaban

  • Bab Trigonometri
    Matematika SMA Kelas X

    1] cos 2x = 0
    2x = π/2
    x = π/4

    2x = 3π/2
    x = 3π/4

    2x = 5π/2
    x = 5π/4

    2x = 7π/2
    x = 7π/4

    HP = {π/4, 3π/4, 5π/4, 7π/4}

    2] √3 tan 3x + √3 = 0
    √3 tan 3x = -√3
    tan 3x = -√3/√3
    tan 3x = - 1
    3x = 3π/4
    x = π/4

    3x = 7π/4
    x = 7π/12

    3x = 11π/4
    x = 11π/12

    3x = 15π/4
    x = 5π/4

    3x = 19π/4
    x = 19π/12

    3x = 23π/4
    x = 23π/12

    HP = { π/4, 7π/12, 11π/12, 5π/4, 19π/12. 23π/12 }



  • 1]
    cos 2x = 0
    2x = phi/2
    x = phi/4
    2x = 3phi/2
    x = 3phi/4
    2x = 5phi/2
    x = 5phi/4
    2x = 7phi/2
    x = 7phi/4


    Jadi HPnya adalah {(phi/4 , 3phi/4 , 5phi/4 , 7phi/4) }

    2]
    V3 tan 3x + V3 = 0
    V3 tan 3x = -V3
    tan 3x = -V3/V3
    tan 3x = -1
    3x = 3phi/4
    x = 3phi/12
    x = phi/4
    3x = 7phi/4
    x = 7phi/12
    3x = 11phi/4
    x = 11phi/12
    3x = 15phi/4
    x = 15phi/12
    x = 5phi/4
    3x = 19phi/4
    x = 19phi/12
    3x = 23phi/4
    x = 23phi/12

    Jadi HPnya adalah {(phi/4 , 7phi/12 , 11phi/12 , 5phi/4 , 19phi/12 , 23phi/12) }

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