question_answer

If \[Se{{c}^{-1}}x=\cos e{{c}^{-1}}y\],then the value of \[{{\cos }^{-1}}\frac{1}{x}+{{\cos }^{-1}}\frac{1}{y}\]

A)  \[\frac{\pi }{4}\]          

B)  \[-\frac{\pi }{2}\]       

C) \[\pi \]               

D)  \[\frac{\pi }{2}\]