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यदि $\alpha \neq 1$ इकाई का कोई $n^{th}$ मूल है,तो $S = 1 + 3\alpha + 5\alpha^2 + \dots$ $n$ पदों तक,किसके बराबर है?

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${\left[ {\frac{{1 + \cos (\pi /8) + i\sin (\pi /8)}}{{1 + \cos (\pi /8) - i\sin (\pi /8)}}} \right]^8}$ का मान ज्ञात कीजिए।

यदि $1, \alpha_1, \alpha_2, \ldots, \alpha_{n-1}$ इकाई के $n^{\text{th}}$ मूल हैं,तो $\sum_{1 \leq i < j \leq n-1} \alpha_i \alpha_j =$

$(\sqrt{\sqrt{2}+1} + i\sqrt{\sqrt{2}-1})^8 =$

यदि $z = \frac{\sqrt{3}}{2} + \frac{i}{2}$,जहाँ $i = \sqrt{-1}$,तो $(z^{201} - i)^{8}$ का मान क्या होगा?

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