W ,9, 2) = 520 ((1-2 - - * - -) + 2+2 +me+z") (1) can be used to generate a three-dimensional shell (i.e., a level surface) by setting h(x, y, z) = 0. In terms of the variable h, write an expression for the region inside the shell (not including the shell itself). W ,9, 2) = 520 ((1-2 - - * - -) + 2+2 +me+z") (1) can be used to generate a three-dimensional shell (i.e., a level surface) by setting h(x, y, z) = 0. In terms of the variable h, write an expression for the region inside the shell (not including the shell itself)