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function not evaluating question tia sal2


function not evaluating question tia sal2

Greetings All

I trying to evaluate this function to a numerical value but it doesn;t
seem to work I replace the expression with t sin t and it works what
am I doing wrong?

In[240]:= f = Function[{t}, 0.680232  Cos 6.28319 [t]]
Out[240]:= Function[{t}, 0.680232 Cos 6.28319[t]]


In[241]:= Evaluate [f[2.5]]
Out[241]:= 0.680232 Cos 6.28319[2.5]

Why am I not getting a numerical value?  tia sal2


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