In Pi Jinxing's dream, two curves are said to be CoRoNaViRaL if whenever they intersect, the two lines tangent to the curves passing through the intersection point meet at an angle of 90 degrees. Note that two lines intersect at a right angle if the product of their slopes is -1. Prove that the curves y? 1 and y? = 1 %3D 18 8. are CoRoNaViRaL.

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