defence exam Army Havildar SAC Mock Test Series 2025 Mathematics Complex Numbers De Moivre's Theorem

\(\rm \frac{\cos\theta+i\sin\theta}{\cos\theta-i\sin\theta}\) का मान क्या है?

1
1
2
cos 2θ - i sin 2θ
3
cos 2θ + i sin 2θ
4
इनमें से कोई नहीं
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