If |z-25i| lt= 15. then |"maximum " arg(...

If `|z-25i| lt= 15.` then `|"maximum " arg(z) - "minimum " arg(z)|` equals

`2 cos^(-1) (3//5)`

`2 cos^(-1) (4//5)`

`pi//2 + cos^(-1) (3//5)`

`sin^(-1) (3//5) - cos^(-1) (3//5)`

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The correct Answer is:

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arg ( bar(z)) is equal to

`pi `- arg (z)

`2 pi -`arg (z)

`pi +` arg (z)

`2pi + ` arg (z)

`(1)/(2) arg (z)`

`(1)/(3) arg (z +1)`

`(1)/(2) arg (z-1)`

None of these

`(pi)/(3)`

`(2 pi)/( 3)`

`(pi)/(2)`