Difference between revisions of "Relationship between sin and sinh"

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<strong>[[Relationship between sin and sinh|Theorem]]:</strong> The following formula holds:
 
<strong>[[Relationship between sin and sinh|Theorem]]:</strong> The following formula holds:
$$\sin(x)=-i \sinh(ix),$$
+
$$\sin(z)=-i \sinh(iz),$$
 
where $\sin$ denotes the [[sine]] and $\sinh$ denotes the [[sinh|hyperbolic sine]].
 
where $\sin$ denotes the [[sine]] and $\sinh$ denotes the [[sinh|hyperbolic sine]].
 
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Revision as of 05:33, 25 August 2015

Theorem: The following formula holds: $$\sin(z)=-i \sinh(iz),$$ where $\sin$ denotes the sine and $\sinh$ denotes the hyperbolic sine.

Proof: