Cho \(\cos \alpha  = 0,8\) và \(\frac{{3\pi }}{2} var DOMAI...

A. \(\cos \alpha  =  - \frac{{\sqrt {21} }}{5}\)

B. \(\tan \alpha  =  - \frac{3}{4}\)

C. \(\cot \alpha  = \frac{8}{{13}}\)

D. \(\sin \alpha  = \frac{7}{{\sqrt {410} }}\)