Bài 2. Phương trình lượng giác cơ bản
Hướng dẫn giải Hoạt động 6 (Trang 26 SGK Toán Đại số & Giải tích 11)
<div> <p><strong>Giải c&aacute;c phương tr&igrave;nh sau:</strong></p> </div> <div id="sub-question-1" class="box-question top20"> <p>&nbsp;a)&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>c</mi><mi>o</mi><mi>t</mi><mfenced><mi>x</mi></mfenced><mo>=</mo><mn>1</mn></math></p> </div> <div id="sub-question-2" class="box-question top20"> <p>&nbsp;b)&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>c</mi><mi>o</mi><mi>t</mi><mfenced><mi>x</mi></mfenced><mo>=</mo><mo>-</mo><mn>1</mn></math></p> </div> <div id="sub-question-3" class="box-question top20"> <p>&nbsp;c)&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>c</mi><mi>o</mi><mi>t</mi><mfenced><mi>x</mi></mfenced><mo>=</mo><mn>0</mn></math></p> <p><strong>Lời giải chi tiết:</strong></p> <p>a) <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>c</mi><mi>o</mi><mi>t</mi><mfenced><mi>x</mi></mfenced><mo>=</mo><mn>1</mn><mo>&#8660;</mo><mi>c</mi><mi>o</mi><mi>t</mi><mfenced><mi>x</mi></mfenced><mo>=</mo><mi>c</mi><mi>o</mi><mi>t</mi><mfenced><mfrac><mi mathvariant="normal">&#960;</mi><mn>4</mn></mfrac></mfenced><mo>&#8660;</mo><mi>x</mi><mo>=</mo><mfrac><mi mathvariant="normal">&#960;</mi><mn>4</mn></mfrac><mo>+</mo><mi>k</mi><mi mathvariant="normal">&#960;</mi><mo>,</mo><mi mathvariant="normal">k</mi><mo>&#8712;</mo><mi mathvariant="normal">&#8484;</mi></math></p> <p>b)&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>c</mi><mi>o</mi><mi>t</mi><mfenced><mi>x</mi></mfenced><mo>=</mo><mo>-</mo><mn>1</mn><mo>&#8660;</mo><mi>c</mi><mi>o</mi><mi>t</mi><mfenced><mi>x</mi></mfenced><mo>=</mo><mi>c</mi><mi>o</mi><mi>t</mi><mfenced><mrow><mo>-</mo><mfrac><mi mathvariant="normal">&#960;</mi><mn>4</mn></mfrac></mrow></mfenced><mo>&#8660;</mo><mi>x</mi><mo>=</mo><mo>-</mo><mfrac><mi mathvariant="normal">&#960;</mi><mn>4</mn></mfrac><mo>+</mo><mi>k</mi><mi mathvariant="normal">&#960;</mi><mo>,</mo><mi mathvariant="normal">k</mi><mo>&#8712;</mo><mi mathvariant="normal">&#8484;</mi></math></p> <p>c)&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>c</mi><mi>o</mi><mi>t</mi><mfenced><mi>x</mi></mfenced><mo>=</mo><mn>0</mn><mo>&#8660;</mo><mi>c</mi><mi>o</mi><mi>t</mi><mfenced><mi>x</mi></mfenced><mo>=</mo><mi>c</mi><mi>o</mi><mi>t</mi><mfenced><mfrac><mi mathvariant="normal">&#960;</mi><mn>2</mn></mfrac></mfenced><mo>&#8660;</mo><mi>x</mi><mo>=</mo><mfrac><mi mathvariant="normal">&#960;</mi><mn>2</mn></mfrac><mo>+</mo><mi>k</mi><mi mathvariant="normal">&#960;</mi><mo>,</mo><mi mathvariant="normal">k</mi><mo>&#8712;</mo><mi mathvariant="normal">&#8484;</mi></math></p> </div> <p><br /><br /><br /></p>
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