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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Some graphing calculators:

SINE: Graphing calculator function
TIS: Some graphing calculators
PLOT: Graphing calculator output
COSINE: Graphing-calculator function
CASIO: Maker of the world's first publicly sold graphing calculator
SLOPE: Graph calculation
COS: Graphing calculator button
ALUMNI: Sellers of used graphing calculators, maybe