Pre-Calculus

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What are the ABCs and...

What are the ABCs and the 2 + 2= 4 of Pre-Calculus? What is the very first thing they teach in Pre-Calculus? Can you please work out such a Pre-Calculus problem or explain such a formula? Additionally, in Pre-Calculus, what is a or the vortex? Can you please explain that please? Thank you.

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