Feel free to indicate the imaginary unit with ‘X’ or some other distinct symbol during your derivations.

According to its German Wikipedia article, the Caspian Sea is called sea and not lake only because of its size and salinity, not because it matches the relevant definitions of a sea.

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Unless somebody is scolling through the ‘all’ feed.

Edit: However, in a work environment the user has probably ‘hide content marked as NSFW’ toggled.