The angle between the lines x/a+y/b=1 an...

The angle between the lines `x/a+y/b=1` and `x/a-y/b=1` will be:

A

1) `2 tan ^(-1)""b/a`

B

2) `tan ^(-1) ""(2ab)/(a ^(2) + b^(2))`

C

3) `tan ^(-1) "" (a ^(2) -b^(2))/(a ^(2) +b^(2))`

D

4) None of these

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The correct Answer is:

A

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