I have the following formula:

s'[t] == 230.94 Tan[0.914743 - 0.138564 t]

When I solve this by hand I get:

s[t] == 1666.67*Log[Cos[0.914743-0.138564t]] + c

But Mathematica just returns:

DSolve[s'[t] == 230.94 Tan[0.914743 - 0.138564 t], s[t], t]

s[t] == Integral[ 230.94 Tan[ 0.914743 - 0.138564t ]dt ] + c

Do you know why it isn't solving the integral?