Question

( left(x+frac{1}{x}right)^{2}=x^{2}+left(frac{1}{x}right)^{2}+2 )
a) ( left(x-frac{1}{x}right)^{2}+4 )
( begin{aligned} & x^{2}+frac{1}{x^{2}}-2+4 &left.>x^{2}+frac{1}{x^{2}}+2right] end{aligned} )

# 20. (x + 1/x)2 = (a) (x - 1/x)2 + 4 (c) (a) and (b) both (b) (x - 1/x)2 - 4 (d) None

Solution