If i z^4+1=0, then prove that z can take...

If `i z^4+1=0,` then prove that `z` can take the value `cospi//8+is inpi//8.`

A

`(1+i)/sqrt2`

B

`"cos"pi/8+i"sin"pi/8`

C

`1/(4i)`

D

i

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The correct Answer is:

B

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