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evaluate the principal value of $i^{i+1}$ and derive a general expression for $\arccos(A)$, where $A$ is a real number $> 1$ and hence find $\arccos (3)$, writing your answer in the same form,

have to use quadratic equation that uses $\exp(iz)$

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    Please let us know where you get stuck instead of (poorly) pasting in a question straight from your textbook.2012-12-04

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