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

Toán Lớp 11: Giải phương trình :Sin5x-sin(x+2pi/5)=0 Pleaseeeeeeee ,helppp meeeee????????????????????

Toán Lớp 11: Giải phương trình :Sin5x-sin(x+2pi/5)=0
Pleaseeeeeeee ,helppp meeeee????????????????????

Comments ( 1 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     sin\ 5x-sin\ (x+\frac{2\pi}{5})=0
    ⇔ sin\ 5x=sin\ (x+\frac{2\pi}{5})
    ⇔ \(\left[ \begin{array}{l}5x=x+\dfrac{2\pi}{5}+k2\pi\ (k \in \mathbb{Z})\\5x=\pi-x-\dfrac{2\pi}{5}+k2\pi\ (k \in \mathbb{Z})\end{array} \right.\) 
    ⇔ \(\left[ \begin{array}{l}4x=\dfrac{2\pi}{5}+k2\pi\ (k \in \mathbb{Z})\\6x=\dfrac{3\pi}{5}+k2\pi\ (k \in \mathbb{Z})\end{array} \right.\) 
    ⇔ \(\left[ \begin{array}{l}x=\dfrac{\pi}{10}+k\dfrac{\pi}{2}\ (k \in \mathbb{Z})\\x=\dfrac{\pi}{10}+k\dfrac{\pi}{3}\ (k \in \mathbb{Z})\end{array} \right.\) 

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

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