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Math Help - lagrange multipler

  1. #1
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    lagrange multipler

    by using lagrange multiplier
    we can find the maximum or minimum value of F(x,y)

    we know when using application of differentiation we need to reduce to 1 variables
    and then do (second d) in order to determine whether it is maximum or minimum

    however in lagrange multiplier
    it don't need to (second d)
    so how can we know it is maximum or minimum???
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