MATLAB: How to change the format of the answer

formatilaplace

I got the output of the inverse laplace like below.
How can I change this into the equation with the calculated values?
dphi_t =
 
(18231298392664843931137914740085*symsum(exp(t*root(s3^4 + (7222590806255583*s3^2)/1180591620717411303424 + 2261458668024229/309485009821345068724781056, s3, k))/(524288*(2361183241434822606848*root(s3^4 + (7222590806255583*s3^2)/1180591620717411303424 + 2261458668024229/309485009821345068724781056, s3, k)^3 + 7222590806255583*root(s3^4 + (7222590806255583*s3^2)/1180591620717411303424 + 2261458668024229/309485009821345068724781056, s3, k))), k, 1, 4))/288230376151711744 + 38685626227668131840*symsum((exp(root(s3^4 + (7222590806255583*s3^2)/1180591620717411303424 + 2261458668024229/309485009821345068724781056, s3, k)*t)*root(s3^4 + (7222590806255583*s3^2)/1180591620717411303424 + 2261458668024229/309485009821345068724781056, s3, k))/(524288*(2361183241434822606848*root(s3^4 + (7222590806255583*s3^2)/1180591620717411303424 + 2261458668024229/309485009821345068724781056, s3, k)^2 + 7222590806255583)), k, 1, 4)

Best Answer

I am not certain what you want.
Try the vpa funciton: 
dphi = vpa(dphi, 5)
producing: 
dphi =
(1.25e-7*s^2 + 2.0438e-13)/(s^4 + 6.1178e-6*s^2 + 7.3072e-12)
also: 
ltx = latex(dphi)
produces:
or with a bit of editing:
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