As shown in the figure, in the rectangular coordinate system,? The edge OC of AOCD is on the x axis, and the edge AD intersects with the y axis at point h, with CD= 10 and SIN ∠ OCD = FRAC {4} {5}. Point E and point F are the moving points on the edge AD and diagonal OD respectively (point E is different from point A-junior high school mathematics-elite network).
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I don't know the last question. ............. only knew that the first question was: y=x?