1.

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

Answer»

`y^2 = 2ax -(1-b^2)X^2`
`TAN""(PI)/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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