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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)[(2lm)/(l^2+m^2)]`

Text Solution

Verified by Experts

The correct Answer is:
B
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