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If x^2+2h x y+y^2=0 represents the equat...

If `x^2+2h x y+y^2=0` represents the equation of the straight lines through the origin which make an angle `alpha` with the straight line `y+x=0` then, (a) `s e c2alpha=h` (b) `cosalpha` `=sqrt(((1+h))/((2h)))` (c) `2sinalpha` `=sqrt(((1+h))/h)` (d) `cotalpha` `=sqrt(((1+h))/((h-1)))`

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