10.(10%) Show that the line integrals 
F3dz) in a domain D in space is path independent if and only if
is the gradient of some function f in D.
阿摩線上測驗
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阿摩線上測驗
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10.(10%) Show that the line integrals F3dz) in a domain D in space is path independent if and only if is the gradient of some function f in D.