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These are two different verbal expressions. "Must have" tends to show something that is probable, and is used like this: He must have been sick yesterday, or else he would have come to class. She must have been delayed, because she is never late for a meeting.
"Had to" tends to show obligation, and is used this way: I had to take "Statistics" a second time, because I failed it the first time. She had to wait for two hours before the train finally arrived. (Note: in the present tense, this becomes "have to"-- I have to go now; my sister is expecting me to take her to dinner.)
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