how I can replace diff(x(t), t) with xdot ?

>> syms t;

>> x=sym('x(t)');

>> f=sin(x);

>> diff(f,t)

ans =

cos(x(t))*diff(x(t), t)

[Ahmed Eltayeb]

sorry my question is: how I can replace diff(x(t), t) with xdot ? thanks

Answer 1

[Oleg Komarov]

syms t xdot;
x  = sym('x(t)');
f  = sin(x);
df = diff(f,t);
subs(df,'diff(x(t), t)',xdot)