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i^9+i^(19)...

`i^9+i^(19)`

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`i^(9)+i^(19)=i^(8)*i+i ^(16)*i^(3)`
`" "=(i^(4))^(2)i+(i^(4))^(4)i^(3)`
`" "=i+i^(3) =i+(-i)=0 `
`rArr" "i^(9)+i^(19)=0+i*0`
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