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The equation of straight line passing th...

The equation of straight line passing through the origin and making an angle `alpha` with the straight line x+y=0 is

A

`y=(tanalpha)x`

B

`x^2+y^2+2xy sec 2alpha=0`

C

`x^2+y^2+2xy=0`

D

none of these

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The correct Answer is:
B
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