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I'm studying calculus of variations, this is a bit of a recap of regular calculus.

You got a function, but you plug a vector that is parameterized so your function becomes parameterized, then you take the derivative in 3.5, and then they say: put the parameter to zero in 3.6, but then you divide by zero, I don't get it.

Cheers

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# Dividing by a parameter that is zero

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