Question: Expression evaluation with composed variables

Hello,

I have a easy question I think but blocking for me.

I have a expression g(t):=f(x(t),alpha(t),beta(t))

I give 

x(t):=0.12
alpha(t):=0
beta(t):=0

I would like to evaluate g(t).

And for the moment x(t), alpha(t) and beta(t) aren't replaced by their values.

How can i do in order to have the evaluation of g(t) ?

Thanks a lot for help.

 

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