Casio fx-991EX keeps giving math error for simple calculations like ((1/2)/2) and sin inverse (10) etc. Any idea on how to fix this? Is there a chance that the calculator may be
UP ACES on Twitter: "Only PRC-approved scientific calculators and Casio fx- 991es are allowed to be used in the National Civil Engineering Quiz 2018. Casio Classwiz fx-991 EX is NOT allowed. #NCES2018 #BuildForTheNation
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