Determine all absolute extrema of each function. . If there are no absolute extrema of a given type, say none. Enter each point as an ordered pair, e.g., "(1,5)". If an extreme value is gotten twice, enter a comma-separated list of ordered pairs:

D(x, y) = 4x2 6xy + 5y2 + 3 on the closed triangular region in the first quadrant bounded by the lines x = 0, y = 6, y = x. , attained at (x, y) = =:= Absolute maximum value is Absolute minimum value is , attained at (x, y) =