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The Casio 991ES calculator and matrices, complex numbers, differentiation, integration, sums of series | A minimum of blind calculation
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Casio FX-991EX Engineering/Scientific Calculator, Black (European Version), 3" x 6.5" x 0.4": Amazon.co.uk: Stationery & Office Supplies
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Casio Classwiz FX-991EX FX-87DEX FX-570EX Matrix Determinant and Matrix Inverse calculation - YouTube
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