Wronskians
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Determine whether the functions can be Wronskians on -1<x<1 for a pair of solutions to some equation y'' + py' +qy = 0 with p and q continuous.
a) W(x) = 6e^4x
b) W(x) = x^3
c) W(x) = 0
d) W(x) = (x -1/2)^1/2
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