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Complex Numbers

Solve 1-1+2...

Question

Solve ${(1^{- 1} + 2^{- 1})}^{- 2}$

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Solution

$(1^{- 1} + 2^{- 1})^{- 2}$
$(1 + \frac{1}{2})^{- 2}$

$(\frac{2 + 1}{2})^{- 2}$

$(\frac{3}{2})^{- 2}$

$(\frac{2}{3})^{2}$

$\frac{4}{9}$

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