Please confirm that this is not an oversight or minor error with algebra.
Hi @gidu, welcome to the forum! This does look like a typo. Thank you for letting us know!
Hi, this bug is still present. I have verified that gidu is correct myself before arriving at this thread by means of a CAS
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Hi @jhanschoo, welcome to the Forum!
Thanks for the catch! I’ve made a pull request for the fix. The change should be live in the next couple of days. Thanks again for the note here 
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Hi all, the typo has now been fixed!
Well done Catalina.
Gideon
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Hello. Perhaps I am missing something, but I am afraid the typo was transferred a couple of equations ahead.
Hi, @hanzyrg and welcome to the Forum!
Thanks for spotting it and reporting it. You are right! the error hadn’t been corrected to the end of the derivation.
I have fixed it and you will be able to see the updated version by the end of this week or sooner.
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Good to know. Thanks