Oh, it sounds like Ivm asking those questions rhetorically. I'm not. They are very subtle and difficult questions. Ponder them and think about them. Part of the problem is that we really abuse what $\sqrt {a} $ means. What does it mean? how many values does it have? Is it unambiguous in meaning?
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A SIM card is a crucial component in mobile devices. If you’re wondering, “what does SIM stand for?” it’s an acronym for Subscriber Identity Module, which securely stores your unique subscriber information. This includes your mobile number, network identification details and some personal data. The card itself is a small electronic chip that can be inserted into smartphones, tablets ...
The correct (or at least original) spelling for the term is "wot". "What, what!" is a malaprop that results from, and perpetuates, a misinterpretation of the term's meaning. "Wot" is very old. It comes from an archaic formal third-person conjugation of "wit" (the verb), which at one time used to mean "to know" or "to understand". The full phrase, then, was originally "you wot". It eventually ...
Is "wot wot" or "what-what" an authentic British expression? If it's ...
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From my point of view, if the difference between what about and how about in general is slight, the difference between what about you and how about you is even slighter. They are certainly interchangeable, as you mentioned, but I would go so far as to say that their common usages are semantically indistinguishable. In point of usage, Ngrams shows a slight preference for What about you: COCA ...