find the value of (1-i)^4
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Step-by-step explanation:
(1+i)4+(1−i)4
⇒ [(1+i)2]2+[(1−i)2]2
We know, (a+b)2=a2+2ab+b2 and (a−b)2=2−2ab+b2
⇒ [1+2i+i2]2+[1−2i+i2]2
⇒ [1+2i−1]2+[1−2i−1]2 [ i2=−1 ]
⇒ (2i)2+(−2i)2
⇒ 4i2+4i2
⇒ −4−4
⇒ −8
∴ (1+i)4+(1−i)4=−8
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