A. \(\sin {150^ \circ } = \frac{{\sqrt 3 }}{2},c{\rm{os}}{150^ \circ } = - \frac{1}{2},\tan {150^ \circ } = - \sqrt 3 ,\cot {150^ \circ } = - \frac{1}{{\sqrt 3 }}\)
B. \(\sin {150^ \circ } = \frac{{\sqrt 3 }}{2},c{\rm{os}}{150^ \circ } = -\frac{1}{2},\tan {150^ \circ } = \sqrt 3 ,\cot {150^ \circ } = \frac{1}{{\sqrt 3 }}\)
C. \(\sin {150^ \circ } = \frac{1}{2},c{\rm{os}}{150^ \circ } = \frac{\sqrt{3}}{2},\tan {150^ \circ } = \frac{1}{\sqrt{3}} ,\cot {150^ \circ } = {\sqrt 3 }\)
D. \(\sin {150^^\circ } = \frac{1}{2},c{\rm{os}}{150^^\circ } = - \frac{{\sqrt 3 }}{2},\tan {150^^\circ } = - \frac{1}{{\sqrt 3 }},\cot {150^^\circ } = - \sqrt 3 \)
D
Ta có
sin150o=sin30o=1/2,cos150o=-cos30o=-√3/2 ;
tan150o=-tan30o= -1/√3,cot150o=-cot30o=-√3.
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