I essentially am not in madness' says Hamlet (act 3, scene 4) Name four lines spoken by Hamlet in this act which might make you doubt this?
An interesting question.
First, I'd go with his line when he kills Polonius:
Ham. [Drawing.] How now! A rat? Dead, for a ducat, dead! Kills POLONIUS [through the arras].
If he really thinks Polonius is a rat, that's crazy.
Related is this line:
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