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How can I find roots in Mathematica 6?

• To: mathgroup at smc.vnet.net
• Subject: [mg83517] How can I find roots in Mathematica 6?
• From: DrunkenButterfly <darkladymacbeth at hotmail.com>
• Date: Thu, 22 Nov 2007 04:41:30 -0500 (EST)

Does anyone know what should I type in in order to find the roots of 

cosh(z)=i with Abs[Im[z]]<10    ?

I've just started using Mathematica 6 and the help browser is not really helping me at all. Thanks!