question_answer

If \[\cos \alpha =\frac{3}{5}\], then the value of \[\frac{sin\alpha -\frac{1}{\tan \alpha }}{2\tan \,\,\alpha }\] is

A) \[\frac{3}{160}\]

B) \[\frac{841}{160}\]

C) \[\frac{41}{160}\]

D) \[\frac{31}{160}\]