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Identify the substance oxidised, reduced...

Identify the substance oxidised, reduced, oxidising agent and reducing agent for each of the following reactions :
`HCHO (l) + 2 [Ag(NH_3)_2] (aq) + 3OH^- (aq) rarr 2Ag(s) + HCOO^- (aq) + 4NH_3(aq) + 2H_2O(l)`

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