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The point on the curve y^2=x where tange...

The point on the curve `y^2=x` where tangent makes `45^o` angle with x-axis is
(a)`(1//2,\ 1//4)`
(b) `(1//4,\ 1//2)`
(c) `(4,\ 2)`
(d) `(1,\ 1)`

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