(part 1 of 4) Determine fa- fy when 1. 2. 3. 4. 6. f(x, y) = 4x² + 4xy - 4y² + x + 2y. fx-fy = 12x - 4y - 1 fx - fy = 12x - 4y +3 fx fy = 4x+12y - 1 fx fy= 4x+12y+3 fx - fy = 12x+12y+3 fx - fy = 4x - 4y - 1 (part 2 of 4) Determine fx + fy when f(x, y) = 1. fx + fy 2. fx + fy 3. fx + fy 4. fx + fy 5. fx + fy 6. fx + fy = 2x² 3xy + 3y² + 3x − y. = = = = = x + 3y + 4 7x + 3y + 4 x + 3y + 2 X - 7x - 9y+2 - 9y+2 7x9y+4 (part 3 of 4) Determine fx when 1. fx 2. fx 3. fx 4. fx 5. fx 6. fx f(x,y) = = = = = = = (x² + 2y) (y² − x). - 4xy² − y + 3x² y - 4xy² + 3x² y + 4xy² + 3x² 2xy²– 2y - 3x² 2y - 2xy² - 3x² 2xy² + 2y - 3x²

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