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Precalculus
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OpenStudy (anonymous):
if x=tan(√(-1)) what is the imaginary value of x?
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OpenStudy (dumbcow):
\[x = \tan i = i \tanh 1 = i (\frac{e - e^{-1}}{e + e^{-1}})\] http://en.wikipedia.org/wiki/Hyperbolic_function#Standard_algebraic_expressions
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