Question: (a) Show that the surfaces intersect at the given point (b) Show that the surfaces have perpendicular tangent planes at this point. z = 2xy,

(a) Show that the surfaces intersect at the given point

(b) Show that the surfaces have perpendicular tangent planes at this point.

z = 2xy², 8x² - 5y² - 8z = -13, (1, 1, 2)

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