FullSimplify with assumptions

Is there a way to write a FullSimplify at the end of the line with some assumptions?

That is, if I write

a^2+b^2+2 a b //FullSimplify[...]

is there any way to include some assumptions for a,b?

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... //FullSimplify[#, ...]& –  Kuba Jul 15 '14 at 18:09