If \( \mathrm{z} \) is a complex number of unit modulus and \( \ope...

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If \( \mathrm{z} \) is a complex number of unit modulus and \( \operatorname{argument} \theta \), then \( \arg \left(\frac{1+\mathrm{z}}{1+\overline{\mathrm{z}}}\right) \) equals
\( \mathrm{P} \)
(1) \( \frac{\pi}{2}-\theta \)
(2) \( \theta \)
(3) \( \pi-\theta \)
(4) \( -\theta \)
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