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What is the angle between the lines `x+y=1` and `x-y=1` ?A. `pi/6`B. `pi/4`C. `pi/3`D. `pi/2`

Answer» Correct Answer - D
Slope of `x+y=1` is -1
Slope of `x-y=1` is 1
Let `tan A=-1, tan B=1`
`A=(3pi)/4, B=pi/4`
`A-B=pi/2`


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