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GATE Mechanical 2014 Set 1 | Question: 3

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The argument of the complex number $\dfrac{1+\imath }{1-\imath }$ where $\imath =\sqrt{-1}$ ,is

A. $-\pi$

B. $\dfrac{-\pi }{2}$

C. $\dfrac{\pi }{2}$

D. $\pi$

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