A = (x+1/x)² -(x-1/x)²
A=x² + 2*x*(1/x)+ 1/x² - x²+2*x*(1/x) -1/x²
A =x² +2 +1/x² -x²+2 -1/x²
A=2+2=4
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A = (x+1/x)² -(x-1/x)²
A=x² + 2*x*(1/x)+ 1/x² - x²+2*x*(1/x) -1/x²
A =x² +2 +1/x² -x²+2 -1/x²
A=2+2=4