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The diagonals of the parallelogram whose...

The diagonals of the parallelogram whose sides are `
` `lx+m y+n=0, l x+m y+n^(prime)=0` `
` `m x+l y+n=0, m x+l y+n^(prime)=0` include an angle

A

`(pi)/(3)`

B

`(pi)/(2)`

C

`tan ^(-1)((l^(2)-m^(2))/(l^(2)+m^(2)))`

D

`tan ^(-1) ((2 / m))/(l^(2)+m^(2))`

Text Solution

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The correct Answer is:
A
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