1.

If (x - a) cos theta + ysin theta =(x - a ) cos phi + y sin phi = a and tan (theta//2)- tan (phi//2) =2b , then

Answer»

`y^2=2ax-(1-B^2)x^2`
`tan""(theta)/2=1/(x)(y+BX)`
`y^2=2bx-(1-a^2)x^2`
`tan""(phi)/2=1/(x) (y - bx)`

ANSWER :A::B::D


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