question_answer

If \[|z-25\,i|\,\,\le \,\,15,\]  then \[|max.\,amp\,\,\left( z \right)\text{ }-min.amp\,\,\left( z \right)|\,=\]

A)  \[{{\cos }^{-1}}\,\,\left( \frac{3}{5} \right)\]                  

B)  \[\pi -2{{\cos }^{-1}}\,\,\left( \frac{3}{5} \right)\]

C)  \[\frac{\pi }{2}+{{\cos }^{-1}}\,\,\left( \frac{3}{5} \right)\]        

D)  \[si{{n}^{-1}}\,\,\left( \frac{3}{5} \right)-{{\cos }^{-1}}\,\,\left( \frac{3}{5} \right)\]

E)  None of these