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... n let's look at this question. What should we do in the first step? Let's set the coordinates of the moving point M and use Are trigonometric substitution and trigonometric identity theorem right?"

"Then what should we do next, write out the coordinates of other points too! Then it will be obvious, they are all collinear. Can we write down the coordinates of point P? Will the PQ **** come out? Isn't it very obvious?" Simple, right?"

  The people in the class were drowsy and answere ...

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“You…” She stepped back. Then back again, her mouth dropped open. “You… You cannot be…”

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