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

Toán Lớp 11: phương trình sin3x = sin (x + pi/6) có các nghiệm là ?

Toán Lớp 11: phương trình sin3x = sin (x + pi/6) có các nghiệm là ?

Comments ( 2 )

  1. sin3x=sin(x+pi/6)
    ⇔\(\left[ \begin{array}{l}3x=x+\dfrac{\pi}{6}+k2\pi\\3x=\pi-x-\dfrac{\pi}{6}+k2\pi\end{array} \right.\) 
    ⇔\(\left[ \begin{array}{l}2x=\dfrac{\pi}{6}+k2\pi\\4x=\dfrac{5\pi}{6}+k2\pi\end{array} \right.\) 
    ⇔\(\left[ \begin{array}{l}x=\dfrac{\pi}{12}+k\pi\\x=\dfrac{5\pi}{24}+\dfrac{k\pi}{2}\end{array} \right.\) $(k∈Z)$

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