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Given that 2 = -1+i/√2, express in polar form

Mathematics

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Answer

z4=−1z^4 = -1

Step-by-step solution

3 steps

पिछले प्रश्न से, दी गई सम्मिश्र संख्या z=−1+i2z = \frac{-1+i}{\sqrt{2}} का ध्रुवीय रूप है:

z=cos⁡3π4+isin⁡3π4z = \cos \frac{3\pi}{4} + i \sin \frac{3\pi}{4}
  1. z4z^4 ज्ञात करने के लिए डी मोइवर प्रमेय का उपयोग करें।

    डी मोइवर प्रमेय के अनुसार, यदि z=r(cos⁡θ+isin⁡θ)z = r(\cos \theta + i \sin \theta), तो zn=rn(cos⁡(nθ)+isin⁡(nθ))z^n = r^n(\cos(n\theta) + i \sin(n\theta))।
    यहाँ, r=1r=1, θ=3π4\theta = \frac{3\pi}{4} और n=4n=4 है।

    z4=14(cos⁡(4⋅3π4)+isin⁡(4⋅3π4))z^4 = 1^4 \left(\cos\left(4 \cdot \frac{3\pi}{4}\right) + i \sin\left(4 \cdot \frac{3\pi}{4}\right)\right)
  2. कोण को सरल करें।

    z4=cos⁡(3π)+isin⁡(3π)z^4 = \cos(3\pi) + i \sin(3\pi)
  3. त्रिकोणमितीय मानों की गणना करें।

    हम जानते हैं कि cos⁡(3π)=cos⁡(π+2π)=cos⁡(π)=−1\cos(3\pi) = \cos(\pi + 2\pi) = \cos(\pi) = -1 और sin⁡(3π)=sin⁡(π+2π)=sin⁡(π)=0\sin(3\pi) = \sin(\pi + 2\pi) = \sin(\pi) = 0।

    z4=−1+i⋅0z^4 = -1 + i \cdot 0 z4=−1z^4 = -1

    अतः, z4z^4 का मान है:

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