x²-2•x•2+4 + x²- 1
x²-2x²+4 + x² - 1
-x²+4+x²-1
4-1 = 3
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x²-2•x•2+4 + x²- 1
x²-2x²+4 + x² - 1
-x²+4+x²-1
4-1 = 3