Tangential

As illustrated in the figure above, in the frame xOy, we have a line l :x-y-2=0 and a parabola C:y=2px(p>0) I let my pencil whirl around the knuckle of my thumb and re-read the sentence for the third time, try to make sense of it in connection with the figure that shows a sideways parabola on a nearly blank coordinate system. Then I swallow the yell that's bubbling in my gut, press my

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