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If (x-a) cos theta + y sin theta = (x - ...

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

A

`y^(2) = 2ax - (1-b^(2))x^(2)`

B

`"tan" (theta)/(2) = (1)/(x) (y + bx)`

C

`y^(2) = 2bx - (1 - a^(2))x^(2)`

D

`"tan" (phi)/(2) = (1)/(x) (y - bx)`

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The correct Answer is:
A, B, D
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