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At what points the slope of the tangen...

At what points the slope of the tangent to the curve `x^2+y^2-2x-3=0` is zero
(a)`(3,\ 0),\ (-1,\ 0)` (b) `(3,\ 0),\ (1,\ 2)` (c) `(-1,\ 0),\ (1,\ 2)` (d) `(1,\ 2),\ (1,\ -2)`

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