Yup, equation (1) is. You can prove it by taking x = a+ b - y.. and then afterward since y is just a label you can change it back to x
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i like this better than the one i criticized -- the transformation is essential you could place the scary looking ln sqrt(2) thing with good old f(·) though; it works because under x → 6 - x, 9 - x ⟷ 3 + x
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nice solution
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What is ln superscript root 2 mean?
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I'm not sure why the ln function matters. Doesn't this work for any function with the 3+x and 9-x distributed the way they are? I mean couldn't you also have cos or sin instead of ln?
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