(c) Let z(x, y) = xr be a function defined on a disk D in the positive quadrant containing the point (1,2). Prove whether z(x, y) satisfies the Clairaut Theorem at (1,2).
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- let f(x,y,z)=ax3y + by2e1-z+cze1+z be a function . Find a, b, c, so that the maximum value of the directional derivative at the point P0(-1,3,1) in the direction of the line parallel to 0x axis 21.(b) Show that the function defined by f(x, y) = is not differentiable at point (0,0). if (x, y) = (0,0), 0 if (x, y) = (0,0)Find all yy such that the distance between the points (3, -8) and (-10, yy) is 19