Câu hỏi trắc nghiệm (10 câu):
-
- A. 1
- B. \(\sqrt 2 \)
- C. \(\sqrt 3 \)
- D. 0
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- A. \(P = \sqrt 3 .\)
- B. \(P = \frac{{\sqrt 3 }}{2}.\)
- C. P = 1
- D. P = 0
-
- A. \(\sin {45^{\rm{O}}} + \cos {45^{\rm{O}}} = \sqrt 2 .\)
- B. \(\sin {30^{\rm{O}}} + \cos {60^{\rm{O}}} = 1.\)
- C. \(\sin {60^{\rm{O}}} + \cos {150^{\rm{O}}} = 0.\)
- D. \(\sin {120^{\rm{O}}} + \cos {30^{\rm{O}}} = 0.\)
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- A. \(\cos B = \frac{1}{{\sqrt 3 }}.\)
- B. \(\sin C = \frac{{\sqrt 3 }}{2}.\)
- C. \(\cos C = \frac{1}{2}.\)
- D. \(\sin B = \frac{1}{2}.\)
-
- A. \(\sin \alpha = \sin \beta .\)
- B. \(\cos \alpha = - \cos \beta .\)
- C. \(\tan \alpha = - \tan \beta .\)
- D. \(\cot \alpha = \cot \beta .\)
-
- A. \(\frac{4}{{\sqrt 3 }}.\)
- B. \(\frac{{1 + \sqrt 3 }}{3}.\)
- C. \(\frac{2}{{\sqrt 3 }}.\)
- D. 2.
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- A. \(\sin \widehat {BAH} = \frac{{\sqrt 3 }}{2}.\)
- B. \(\cos \widehat {BAH} = \frac{1}{{\sqrt 3 }}.\)
- C. \(\sin \widehat {ABC} = \frac{{\sqrt 3 }}{2}.\)
- D. \(\sin \widehat {AHC} = \frac{1}{2}.\)
-
- A. \(P = - \frac{3}{4}.\)
- B. P = 0
- C. \(P = \frac{1}{2}.\)
- D. P = 1
-
- A. \(\sin \alpha .\cos \alpha = {a^2}.\)
- B. \(\sin \alpha .\cos \alpha = 2a.\)
- C. \(\sin \alpha .\cos \alpha = \frac{{{a^2} - 1}}{2}.\)
- D. \(\sin \alpha .\cos \alpha = \frac{{{a^2} - 11}}{2}.\)
-
- A. 30°
- B. 60°
- C. 120°
- D. 150°
