question_answer

If \[si{{n}^{-1}}\,a+si{{n}^{-\,1}}b+si{{n}^{-1}}c=\pi \], then the value of \[a\sqrt{(1-{{a}^{2}})}+b\sqrt{(1-{{b}^{2}})}+c\sqrt{(1-{{c}^{2}})}\]will be

A)  2abc                

B)  abc          

C)  1/2abc             

D)  l/3abc