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

Toán Lớp 11: Giải PT lượng giác : Sin x = √2/2

Toán Lớp 11: Giải PT lượng giác :
Sin x = √2/2

Comments ( 2 )

  1. sin x = (\sqrt{2})/2
    ⇔sin x=sin(π/4)
    ⇔ $\left[\begin{matrix} x=\dfrac{π}{4}+k2π\\ x=π-\dfrac{π}{4}+k2π\end{matrix}\right.$
    ⇔ $\left[\begin{matrix} x=\dfrac{π}{4}+k2π\\ x=\dfrac{3π}{4}+k2π\end{matrix}\right.(k∈Z)$

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

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