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More Matrices and Complex Numbers: Problem Solving using the Casio fx-991ES PLUS Calculator: Brown, Allen: 9781693869464: Amazon.com: Books
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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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Amazon.com : Casio FX-991ES Plus Scientific Calculator Fx 991 Es - New & Sealed ship to world wide : Office Products
Can Casio 991 ES plus solve linear equations with complex numbers as the coefficient of the variables? - Quora
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