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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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Casio FX-9750GII User Manual | Page 322 / 402 | Also for: FX-9860GII, fx-9860G AU PLUS, fx-9860G AU, fx-9860GII SD, fx-9860G SD, FX-9860G, FX-7400GII, E-CON2
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