What is angle \theta such that z is purely. real? [NDA II 2022]

2 n \pi only where n is an integer

NDA Math Complex Numbers

Consider the following for the next three (03) items that follow:
Let z=‌

1+i‌sin‌θ

1−i‌sin‌θ

where i=√−1

[NDA II 2022]

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What is angle θ such that z is purely. real?

[NDA II 2022]

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