November 2019 1 33 Report
Tolong jelaskan dari mana 2xy dan 2 dalam rumus-rumus ini berasal dari:
a. x²+y²=(x+y)²-2xy
b. x²+x⁻²=(x+x⁻¹)²-2
c. x²+x⁻2=(x-x⁻¹)²+2

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