1.

Angle between the lines (x)/( a) + (y)/( b) and (x)/(a) - (y)/( b) = 1 is ….....

Answer»

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

Answer :A


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