Question: How to simplify the product of mix combinations of exponential functions in terms of trignometric functions?

h1=-i(c1*exp(A)-c2*exp(-A));

h2=c2*exp(A)+c1*exp(-A);

A=(i*a/2)*(x+b*t);

c1=sqrt(a+2*lambda)/a;

c2=sqrt(a-2*lambda)/a;

How to simplify the product of h1 and h2 in terms of trignometric functions?

h1*h2=?

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