In analyzing Shakespeare's use of the dagger in "Macbeth," the two correct interpretations from your options are:
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Macbeth's guilt for thinking about killing the king has triggered its appearance. - This interpretation aligns with the idea that the dagger symbolizes Macbeth's inner turmoil and the guilt he feels for contemplating regicide.
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Macbeth's sight of the dagger, which is not actually there, indicates his insanity. - This interpretation reflects the psychological descent of Macbeth, suggesting that the hallucination of the dagger signifies his unstable mental state as he grapples with his ambitions and moral dilemmas.
These interpretations highlight the dagger's role as a manifestation of Macbeth's internal conflict and deteriorating sanity.