question_answer

Find the value of\[\text{cos}{{\text{1}}^{o}}\text{cos2}{}^\circ \text{cos3}{}^\circ .....\text{cos89}{}^\circ \text{cos9}{{0}^{o}}\].

A)  1                            

B)         \[\frac{1}{2}\]   

C)  \[\frac{1}{\sqrt{2}}\]                    

D)         0