Circular and hyperbolic sine differ by the imaginary change of variable: $\sin z=\sinh(iz)/i$.Suggest a slogan
For every \(z\in\CC\), \[ \sin(z) = {1\over i} \sinh(iz). \]
How is $\sin(z)$ written in terms of $\sinh$?
$\sin z = \frac{1}{i}\sinh(iz)$
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