what is i in the answer?

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Si So
Si So on 6 Jan 2021
Commented: Si So on 7 Jan 2021
Hello,
I don't know what is i in the answer of my script. Complex number? how can I simplify it? I need to get rid of i.
syms x(t) s
Dx = diff(x(t),t);
laplace(sin(t)*Dx,t,s)
ans =
- (s*laplace(x(t), t, s - 1i)*1i)/2 + (s*laplace(x(t), t, s + 1i)*1i)/2 - laplace(x(t), t, s - 1i)/2 - laplace(x(t), t, s + 1i)/2
Thank you for helping me
  6 Comments
Si So
Si So on 7 Jan 2021
but in mathematics, it can be defined:
laplace{x(t)}=X(s)
I am solving an ODE by laplace method. So x(t) is the variable of differential equation.

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