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Does the radio have an Aux input mode/button on the face? If so, those are likely the line in connections. Otherwise, they are likely line out connections for an external amplifier. For a quick check, you could pick up an RCA to phono jack adapter (I assume those are RCA jacks) and plug a headphone into the adapter and see if you hear anything. If so, that would be a line out, I think red=right, white=left.
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