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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 11: Giúp m với Cosx – cân3 sinx =-1

Toán Lớp 11: Giúp m với
Cosx – cân3 sinx =-1

Comments ( 1 )

  1. cosx – √3sinx = 1
    ⇔ cosx.1/2 – sinx.√3/2 = 1/2
    ⇔ cosx.cosπ/3 – sinx.sinπ/3 = 1/2
    ⇔ cos(x + π/3) = cosπ/3
    ⇔ x + π/3 = π/3 + k2π
    hoặc x + π/3 = -π/3 + k2π, k nguyên
    ⇔ x = k2π hoặc x = -2π/3 + k2π, k nguyên
     

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222-9+11+12:2*14+14 = ? ( )

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