What movie has a girl pretend to be a guy so she can play basketball?

Ok so there was this movie i saw part of when i was in school. The basic plot i can remember is that it was an 80s-ish movie and the girl disguising herself as a boy so she could play basketball on the boys team. I think her dad knew and was ok with it, and I know one of the guys found out around the middle of the movie when he saw a picture of her in her prom dress. While I think the movie was from the 80s i think it took place in a time period a little earlier, but i could be wrong. Please someone help me find this because it is driving me crazy!

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