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A normal is drawn at a point "(x(1),y(1)...

A normal is drawn at a point "`(x_(1),y_(1))`" of the parabola "`y^(2) - 16x`" and this normal makes equal angle with both "x" and "y" axes,Then point "`(x_(1),y_(1))`" is (a) "`(4,-4)`," (b) "`(2,-8)`" (c) "`(4,-8)`" (d) "`(1,-4)`"

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