algebra basic calculations and formulas
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basic formulas:
(a+b)^2=a^2+2ab+b^2
(a-b)^2=a^2-2ab-b^2
(a+b)^2=a^2+2ab+b^2
(a-b)^2=a^2-2ab-b^2
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basic formula is a sq plus new plus 2ab and asa minus 2ab plus b sq
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