21. Find all the relative extrema (identify as maximum, minimum or saddle points) of the function f(x, y) = x3 + 3xy2 - 3x2 -
21. Find all the relative extrema (identify as maximum, minimum or saddle points) of the function f(x, y) = x3 + 3xy2 - 3x2 - 3yz +4 22. Evaluate S S SQ 1 dV using spherical coordinates if Q is the sphere x2 + yz + z? = 25 x2+yz+22
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