Solved
Who finds the mistake?
Hi everyone,
I am reconstructing, in a Mathcad 15 worksheet, the proof of a theorem but the result gives me the wrong sign. Can anyone tell me where the mistake is? See photos:



Hi everyone,
I am reconstructing, in a Mathcad 15 worksheet, the proof of a theorem but the result gives me the wrong sign. Can anyone tell me where the mistake is? See photos:



eq 17 - right hand side
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