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3. The pressure (units: pascal, Pa) within a rectangular chamber is given by P(x, y, z) = V36x2 + 9g2 + 422 - 72x+ 18y + 45. 10 5 0 -10 10 0 -5 -10 -10 -5 0 5 10 (i) Write the equation of the contours in standard form and describe the surface. (ii) Parametrically define the general contour surface. Two parameters, say u and v, are required to parametrist a surface