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20 15 detailed explanation of the answers to the last two questions in Fan Jing Moore's mathematics.
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).

/Math/Ques/Detail/ba 807279-0a 10-4587-b77d-da 64 a 72 a 3d 1c

I don't know the last question. ............. only knew that the first question was: y=x?

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