Casio Standard Scientific Calculators, Non-Programmable, Non-Graphing, 10 + 2 Digits, 3-Digit Comma Markers, Plastic Keys, Solar & Battery Power Supply, Black | Fx-991Ex Buy, Best Price in Saudi Arabia, Riyadh, Jeddah, Medina,
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
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