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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` `s e c2alpha=h` `cosalpha` `=sqrt(((1+h))/((2h)))` `2sinalpha` `=sqrt(((1+h))/h)` (d) `cotalpha` `=sqrt(((1+h))/((h-1)))`

A

`sin2alpha`

B

`cos2alpha`

C

`cosec2alpha`

D

`sec2alpha`

Text Solution

Verified by Experts

The correct Answer is:
D
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