2sin (65°-x/4)-1=0 Sin2x=0

2sin (65°-x/4)-1=0
Sin2x=0

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  1. Đáp án:

    2sin (65°-x/4)-1=0

    <=> sin(65°-x/4)=1/2;

    <=> sin(65°-x/4)=sin 30°;

    <=> $\left \{ {{(65°-x/4)=30°+k360°} \atop { (65°-x/4)=180°-30°+k360°}} \right.$ ;

    <=>$\left \{ {{(65°-x/4)=30°+k360°} \atop { (65°-x/4)=150°+k360°}} \right.$ ;

    <=>$\left \{ {{x=140°-k1440°} \atop { y=-340°-k1440°}} \right.$ ;

    b) sin2x=0; <=> sin2x=sin 0;

    <=> 2x=k$\pi$ ;

    <=> x=k$\pi$ /2

    Giải thích các bước giải:

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