Find an equation of the form f(t)=n+mt+(abt)cos(π2t)\displaystyle {f{{\left({t}\right)}}}={n}+{m}{t}+{\left({a}{b}^{{t}}\right)}{\cos{{\left(\frac{\pi}{{2}}{t}\right)}}} that fits the following data:

t01234
f(t)92-17-457


n =  
m =  
a =  
b =