A.\(\cos \alpha = \frac{{\sqrt 5 }}{3};\,\,\tan \alpha = - \frac{2}{3};\,\,\cot \alpha = - \frac{{\sqrt 5 }}{2}\)
B.\(\cos \alpha = \frac{{\sqrt 5 }}{3};\,\,\tan \alpha = \frac{{2\sqrt 5 }}{5};\,\,\cot \alpha = \frac{{\sqrt 5 }}{2}\)
C.\(\cos \alpha = \frac{{\sqrt 2 }}{3};\,\,\tan \alpha = \sqrt 2 ;\,\,\cot \alpha = \frac{1}{2}\)
D.\(\cos \alpha = \frac{1}{3};\,\,\tan \alpha = 2;\,\,\cot \alpha = \frac{1}{2}\)
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Hóa Học lớp 12
