If x^(2)+2hxy+y^(2)=0 represents the equ...

If `x^(2)+2hxy+y^(2)=0` represents the equation of pair of straight lines through origin and which makes an angle `alpha` with the line `x+y=0` then h =

A

`cos 2alpha`

B

`tan 2alpha`

C

`sin2alpha`

D

`sec2alpha`

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The correct Answer is:

D

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