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7d7e 7. Find the total differential for each of the following functions: (a) U = -5x3 - 12xy - 6y (b) U = 7x23 (c)

7d7e

7. Find the total differential for each of the following functions: (a) U = -5x3 - 12xy - 6y (b) U = 7x23 (c) U = 3x3(8x - 7y) (d) U = (5x2 + 7y)(2x - 4y]) 9y's (e) Um X - y (f ) U = (x- 3y)3

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