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Locus of complex number satisfying "a r ...

Locus of complex number satisfying `"a r g"[(z-5+4i)/(z+3-2i)]= -pi/4` is the arc of a circle (a)whose radius is `5sqrt(2)` (b)whose radius is 5 (c)whose length (of arc) is `(15pi)/(sqrt(2))` (d)whose centre is `-2-5i`

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