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

Toán Lớp 11: 2sin^2x – 5sinx + 2 =5 Giải giúp mình với

Toán Lớp 11: 2sin^2x – 5sinx + 2 =5
Giải giúp mình với

Comments ( 2 )

  1. #huy
    2sin^2x – 5sinx + 2 =0
    <=>\(\left[ \begin{array}{l}\sin x=2\\\sin x=\dfrac{1}{2}\end{array} \right.\) 
    <=>\(\left[ \begin{array}{l}x=\dfrac{\pi}{6}+k2\pi\\x=\dfrac{5\pi}{6}+k2\pi\end{array} \right.\) (k\inZZ)

  2. Bạn tham khảo:
    $2sin^{2x}-5sinx+2=0$
    \(\left[ \begin{array}{l}sinx=2\\sinx=\dfrac{1}{2}\end{array} \right.\) 
    \(\left[ \begin{array}{l}sinx=2(L)\\sinx=\dfrac{1}{2}(N)\end{array} \right.\) 
    $sinx=\dfrac{1}{2}$
    $sinx=sin\dfrac{\pi}{6}$
    \(\left[ \begin{array}{l}x=\dfrac{\pi}{6}+k2\pi\\x=\pi-\dfrac{\pi}{6}+k2\pi=\dfrac{5\pi}{6}+k2\pi\end{array} \right.\) 
    $S=\{\dfrac{\pi}{6}+k2\pi; \dfrac{5\pi}{6}+k2\pi | K∈Z\}$

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