Determine the position, type and value of all local extrema of the following functions!
a) f(x, y) = 1 /2 (x^2 + 1) − 2y(2x + 7) + 3x + 9y 2
b) f(s, t) = (s ^3 − 3s)(t + 3) + t(t + 6)
Determine the position, type and value of all local extrema of the following functions! a) f(x, y) = 1 /2 (x^2 + 1) − 2y
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