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OpenStudy (anonymous):
Differential equation question here. http://mathworld.wolfram.com/BrachistochroneProblem.html I am having trouble understanding why am I allowed to use the Beltrami identity like that. Why is df/dx = 0, if f depends implicitly on x? Or doesn't it and I am misunderstanding the solution?
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OpenStudy (anonymous):
Already answered. Thanks anyway.
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