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Өнцгийн                                                                   синус




α өнцөг өгөгдсөн байг. Өгөгдсөн α өнцгийн нэгж радиустай тойргийг огтолсон
цэгийн ординаттай тэнцүү тоог b өнцгийн синус гээд Sin α гэж тэмдэглэнэ.




Тэг өнцгийн ординат тэг учир sin0=0 п өнцгийн ординат 0 учир Sin π =0 байна.
π                           π
  өнцгийн ординат 1 учир Sin =1 байна.
2                           2




    π                                 π
-     өнцгийн ординат нь -1 учир Sin(- )=-1
    2                                 2
π                         1         π 1     π  2
    6
        өнцгийн ординат     учир Sin = ; Sin =
                          2         6 2     4 2
Өнцгийн синусын зарим чанарыг тэмдэглэе. ∀, α өнцгийн ординат нь -1-ээс бага.
1. -1 ≤ Sinα ≤ 1
2. Хэрэв - α өнцөг байхад ординат нь –в тоо гарах учир Sin(−α ) = − Sinα
Эдгээрийг синус тэмдэг дор оруулж бичвэл




Ml         Sin( − α )=-Sin α
π         π    1
            Sin(− ) = − Sin = −
                 6         6    2
                 π         π     2
            Sin(− ) = − Sin = −
                 4         4    2
                 π         π     3
            Sin(− ) = − Sin = −
                 3         3    2




Sin(π − α ) = Sinα

       3π            π       π   2
Sin(      ) = Sin(π − ) = Sin =
        4            4       2  2
      5π          π       π 1
Sin      = Sin(π − ) = Sin =
       6          6       6 2
        2π          π       π   3
 Sin       = Sin(π − ) = Sin =
         3          3       3  2
α өнцгийн нэгж радиустай тойргийн ординат нь b, π + α өнцгийг ординат нь –b
ийм учраас ∀, α өнцгийн хувьд Sin(π + α ) = − Sinα

      5π          π         π     2
Sin      = Sin(π + ) = − Sin = −
       4          4         4    2
      7π          π         π    1
Sin      = Sin(π + ) = − Sin = −
       6          6         6    2
      4π          π         π     3
Sin      = Sin(π + ) = − Sin = −
       3          3         3    2
Нэгж тойргийн α өнцөг дахь ординат α + 2π өнцөг дахь ординат нь тэнцүү ба
α − 2π өнцөг дахь ординат тэнцүү учраас
  Sinα = Sin(α + 2π )
  Sinα = Sin(α − 2π )
  Sinα = Sin(α + 2πn) = Sin(α − 2πn)
                13π           π       π 1
Жишээ нь: Sin       = Sin(2π + ) = sin =
                 6            6       6 2
9π              π       π      2
Sin      = Sin(2π + ) = Sin =
     4              4        4    2
    7π              π       π      3
Sin      = Sin( 2π + ) = Sin =
     3              3        3    2
    11π              π          π      1
Sin       = Sin(2π − ) = Sin( − ) = −
      6              6          6      2
    7π              π          π        2
Sin      = Sin( 2π − ) = Sin(− ) = −
     4              4          4       2
    5π              π          π      3
Sin      = Sin(2π − ) = Sin(− ) =
     3              3          3     2
     π               π
Sin( + 10π ) = Sin = 1
     2               2
       π                π
Sin(− − 24π ) = Sin(− ) = −1
        2                2

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өнцгийн синус

  • 1. Өнцгийн синус α өнцөг өгөгдсөн байг. Өгөгдсөн α өнцгийн нэгж радиустай тойргийг огтолсон цэгийн ординаттай тэнцүү тоог b өнцгийн синус гээд Sin α гэж тэмдэглэнэ. Тэг өнцгийн ординат тэг учир sin0=0 п өнцгийн ординат 0 учир Sin π =0 байна.
  • 2. π π өнцгийн ординат 1 учир Sin =1 байна. 2 2 π π - өнцгийн ординат нь -1 учир Sin(- )=-1 2 2
  • 3. π 1 π 1 π 2 6 өнцгийн ординат учир Sin = ; Sin = 2 6 2 4 2
  • 4. Өнцгийн синусын зарим чанарыг тэмдэглэе. ∀, α өнцгийн ординат нь -1-ээс бага. 1. -1 ≤ Sinα ≤ 1 2. Хэрэв - α өнцөг байхад ординат нь –в тоо гарах учир Sin(−α ) = − Sinα Эдгээрийг синус тэмдэг дор оруулж бичвэл Ml Sin( − α )=-Sin α
  • 5. π π 1 Sin(− ) = − Sin = − 6 6 2 π π 2 Sin(− ) = − Sin = − 4 4 2 π π 3 Sin(− ) = − Sin = − 3 3 2 Sin(π − α ) = Sinα 3π π π 2 Sin( ) = Sin(π − ) = Sin = 4 4 2 2 5π π π 1 Sin = Sin(π − ) = Sin = 6 6 6 2 2π π π 3 Sin = Sin(π − ) = Sin = 3 3 3 2
  • 6. α өнцгийн нэгж радиустай тойргийн ординат нь b, π + α өнцгийг ординат нь –b ийм учраас ∀, α өнцгийн хувьд Sin(π + α ) = − Sinα 5π π π 2 Sin = Sin(π + ) = − Sin = − 4 4 4 2 7π π π 1 Sin = Sin(π + ) = − Sin = − 6 6 6 2 4π π π 3 Sin = Sin(π + ) = − Sin = − 3 3 3 2 Нэгж тойргийн α өнцөг дахь ординат α + 2π өнцөг дахь ординат нь тэнцүү ба α − 2π өнцөг дахь ординат тэнцүү учраас Sinα = Sin(α + 2π ) Sinα = Sin(α − 2π ) Sinα = Sin(α + 2πn) = Sin(α − 2πn) 13π π π 1 Жишээ нь: Sin = Sin(2π + ) = sin = 6 6 6 2
  • 7. π π 2 Sin = Sin(2π + ) = Sin = 4 4 4 2 7π π π 3 Sin = Sin( 2π + ) = Sin = 3 3 3 2 11π π π 1 Sin = Sin(2π − ) = Sin( − ) = − 6 6 6 2 7π π π 2 Sin = Sin( 2π − ) = Sin(− ) = − 4 4 4 2 5π π π 3 Sin = Sin(2π − ) = Sin(− ) = 3 3 3 2 π π Sin( + 10π ) = Sin = 1 2 2 π π Sin(− − 24π ) = Sin(− ) = −1 2 2