If eccentric angle of a point lying in t...

If eccentric angle of a point lying in the first quadrant on the ellipse `x^2/a^2 + y^2/b^2 = 1` be `theta` and the line joining the centre to that point makes an angle `phi` with the x-axis, then `theta - phi` will be maximum when `theta` is equal to

`tan ^(-1) sqrt ((b)/(a ))`

`tan^(-1)sqrt ((a)/(b))`

`pi//4`

none of these

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