1.

The normal form of the line x+y+1=0 is

Answer»

`xcos(45^(@))+ysin(135^(@))=1/sqrt(2)`
`xcos(45^(@))+ysin(45^(@))=1/sqrt(2)`
`xcos(225^(@))+ysin(225^(@))=1/sqrt(2)`
`xcos(45^(@))+ysin(45^(@))=-1/sqrt(2)`

ANSWER :C


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