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

Toán Lớp 11: Giải phương trình lượng giác sau; 2sinx – √3 = 0

Toán Lớp 11: Giải phương trình lượng giác sau;
2sinx – √3 = 0

Comments ( 2 )

  1. $2sinx-\sqrt[]{3}=0$
    $⇔sinx=\dfrac{\sqrt[]{3}}{2}=sin(\dfrac{\pi}{3})$
    $⇔$\(\left[ \begin{array}{l}x=\dfrac{\pi}{3}+k2\pi\\x=\pi-\dfrac{\pi}{3}+k2\pi=\dfrac{2\pi}{3}+k2\pi\end{array} \right.\) $(k∈Z)$
     

  2. ~rai~
    \(2\sin x-\sqrt{3}=0\\\Leftrightarrow \sin x=\dfrac{\sqrt{3}}{2}\\\Leftrightarrow \left[\begin{array}{I}x=\dfrac{\pi}{3}+k2\pi\\x=\pi-\dfrac{\pi}{3}+k2\pi\end{array}\right.\\\Leftrightarrow \left[\begin{array}{I}x=\dfrac{\pi}{3}+k2\pi\\x=\dfrac{2\pi}{3}+k2\pi.\end{array}\right.\quad(k\in\mathbb{Z})\\\text{Vậy S=}\left\{\dfrac{\pi}{3}+k2\pi;\dfrac{2\pi}{3}+k2\pi\Big|k\in\mathbb{Z}\right\}.\)

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

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