3.Oblicz wartość wyrażenia:
c) (2x-1)²-(2x-1)(1+2x)-(2x+1)² dla x=√2
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4x² - 4x + 1 - 4x² + 1 - 4x² - 4x -1 =
-4x² - 8x +1
dla x = √2 = -4 *(√2)² - 8 * √2 +1 = -8 - 8√2 +1