26.09.2019 Views

Phát triển năng lực tư duy cho học sinh THPT qua dạy học phương trình lượng giác (2019)

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1<br />

2 1<br />

cos2x<br />

<br />

cos 2x cos2x 0 2<br />

2<br />

<br />

cos2x<br />

0<br />

2<br />

2<br />

<br />

2x k2<br />

x k2<br />

3 <br />

<br />

6<br />

<br />

<br />

; k .<br />

<br />

2x k<br />

x k<br />

<br />

2 <br />

4 2<br />

2<br />

Vậy nghiệm của <strong>phương</strong> <strong>trình</strong> là: x k2<br />

;<br />

6<br />

<br />

x k ; k .<br />

4 2<br />

81

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