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invlaplace solution

sungyg 125
February 15 2007
0
Dear Sir: Following is the inverse laplace of the given equation. restart; with(inttrans): X:=-k*(m[1]+m[2])/(s*(k*(m[1]+m[2])+m[1]*s^2*m[2])); invlaplace(X,s,t); The result is something like "1-cosh(a t)". I expect that the result is similar to "1-cos(a t)". How could I get what I want to get? Thanks in advance

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