I have this sentence
"On the other hand, you can go to this page instead."
but I am not sure if the presence of both
On the other hand and
instead makes the sentence redundant.
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... a tautology is a statement which repeats the same idea, using near-synonymous morphemes, words, or phrases, that is, "saying the same thing twice".
As to whether there is always error in it's use:
... it is often considered a fault of style when unintentional. On the other hand, an intentional repetition may be an effective way to emphasize a thought, or help the listener or reader understand a point.