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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Bài tập đề nghị 3<br />

Giải các <strong>phương</strong> <strong>trình</strong> sau:<br />

1) 2 x 3 x 2 x<br />

x<br />

2cos 2 2<br />

x<br />

2) cos3x 2 cos 2 3x 21 sin 2 2x<br />

2 2 2<br />

3) 2<br />

3 tan x tan 2x tan 3x tan xtan2x tan3x<br />

4)<br />

1 1<br />

2 2<br />

2 2<br />

cos x sin x 2<br />

64

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