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If the tangent at the point `P(theta)` to the ellipse `16 x^2+11 y^2=256` is also a tangent to the circle `x^2+y^2-2x=15 ,` then `theta=` (a)`(2pi)/3` (b) `(4pi)/3` (c) `(5pi)/3` (d) `pi/3`

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