find value trigonometric series

From: "Carl R." <solrac140@xxxxxxxxxxx>
Date: Sun, 20 Apr 2008 13:11:25 -0700 (PDT)

Hello,

How can you find the value of sum ( sinh(kx) , k=0...n) where sinh(x)
denotes the hyperbolic sine of x? i.e how to find the value of the sum
sinh(x) + sinh(2x) + sinh(3x) + ...+ sinh(nx) ?

thanks!

.

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