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

Toán Lớp 11: Guip vs Giải pt sau: ( 2sinx+1)(cos2x+2sin2x-10) =0

Toán Lớp 11: Guip vs
Giải pt sau: ( 2sinx+1)(cos2x+2sin2x-10) =0

Comments ( 2 )

  1. ~rai~
    \((2\sin x+1)(\cos2x+2\sin2x-10)=0\\\Leftrightarrow \left[\begin{array}{I}2\sin x+1=0\\\cos2x+2\sin2x-10=0\end{array}\right.\\\Leftrightarrow \left[\begin{array}{I}\sin x=-\dfrac{1}{2}\\\cos2x+2\sin2x=10\text{(PT vô nghiệm vì }a^2+b^2=1^2+2^2<c^2=10^2)\end{array}\right.\\\Leftrightarrow \sin x=\sin\left(-\dfrac{\pi}{6}\right)\\\Leftrightarrow \left[\begin{array}{I}x=-\dfrac{\pi}{6}+k2\pi\\x=\pi+\dfrac{\pi}{6}+k2\pi\end{array}\right.\\\Leftrightarrow \left[\begin{array}{I}x=-\dfrac{\pi}{6}+k2\pi\\x=\dfrac{7\pi}{6}+k2\pi\end{array}\right.\quad(k\in\mathbb{Z})\)

  2. Giải đáp:
     Như hình 
    Lời giải và giải thích chi tiết:
     Có gì k hiểu thì nói 

    toan-lop-11-guip-vs-giai-pt-sau-2sin-1-cos2-2sin2-10-0

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

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