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f[x_]:={Cos[x],Sin[x],Tan[x],Cot[x],SomeComplicatedInterpolationFunction[x]}; 

Save[f.m,f]
f[x_]:={Cos[x],Sin[x],Tan[x],Cot[x],SomeComplicatedInterpolationFunction[x]};
f[x_]:={Cos[x],Sin[x],Tan[x],Cot[x],SomeComplicatedInterpolationFunction[x]}; 

Save[f.m,f]
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f[x_]:={Cos[x],Sin[x],Tan[x],Cot[x],SomeComplicatedInterpolationFunction[x]};