The multiplicative inverse of non-zero ...

The multiplicative inverse of non-zero complex `z=x+iy` is
`(x-iy)/(x^(2)-y^(2))`
`(x-iy)/(x^(2)+y^(2))`
`(x+iy)/(x^(2)+y^(2))`
`(-x+iy)/(x^(2)+y^(2))`

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