1.

If 2d is the shortest distance between the lines x=0,(y)/(b)+(z)/(c)=1,y=0,(x)/(a)-(z)/(c)=1, then

Answer»

`(1)/(a)+(1)/(B)+(1)/(C)=(1)/(d)`
`(1)/(a^(2))+(1)/(b^(2))+(1)/(c^(2))+(1)/(d^(2))=1`
`(1)/(a)+(1)/(b)+(1)/(c)+(1)/(d)=1`
`(1)/(a^(2))+(1)/(b^(2))+(1)/(c^(2))=(1)/(d^(2))`

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