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First derivative
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Hi,
#2 gives the first derivative of A(x) which is ok.
But the result for #3 with A1(x) = 0 is wrong: it should be x = + d/sqrt(8) or x =  d/sqrt(8)
And using the command Derivative[...] in #4 gives a result looking different than #2 which is confusing to students.
Andreas
ggb 4.2.28
Java 6
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