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2\sqrt{2}+\frac{1}{2}-2\sqrt{\frac{1}{2}}
Factor 8=2^{2}\times 2. Rewrite the square root of the product \sqrt{2^{2}\times 2} as the product of square roots \sqrt{2^{2}}\sqrt{2}. Take the square root of 2^{2}.
2\sqrt{2}+\frac{1}{2}-2\times \frac{\sqrt{1}}{\sqrt{2}}
Rewrite the square root of the division \sqrt{\frac{1}{2}} as the division of square roots \frac{\sqrt{1}}{\sqrt{2}}.
2\sqrt{2}+\frac{1}{2}-2\times \frac{1}{\sqrt{2}}
Calculate the square root of 1 and get 1.
2\sqrt{2}+\frac{1}{2}-2\times \frac{\sqrt{2}}{\left(\sqrt{2}\right)^{2}}
Rationalize the denominator of \frac{1}{\sqrt{2}} by multiplying numerator and denominator by \sqrt{2}.
2\sqrt{2}+\frac{1}{2}-2\times \frac{\sqrt{2}}{2}
The square of \sqrt{2} is 2.
2\sqrt{2}+\frac{1}{2}-\sqrt{2}
Cancel out 2 and 2.
\sqrt{2}+\frac{1}{2}
Combine 2\sqrt{2} and -\sqrt{2} to get \sqrt{2}.