1.

If the straight lines ax+by+c=0 and x cos alpha+y sin alpha=c, enclose an angle pi//4 between them and meet the straight line x sin alpha-y cos alpha=0 in the same point, then

Answer»

`a^(2)+B^(2)=C^(2)`
`a^(2)+b^(2)=2`
`a^(2)+b^(2)=2c^(2)`
`a^(2)+b^(2)=4`

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