Complex Number calculations on Casio fx-991-ES Plus (in Hindi) - YouTube
The Casio 991ES calculator and matrices, complex numbers, differentiation, integration, sums of series | A minimum of blind calculation
COMPARING THE EQUATIONS AND COMPLEX NUMBERS OF CANON F-789SGA AND CASIO FX 991ES/570ES | COMPARING THE EQUATIONS AND COMPLEX NUMBERS OF CANON F-789SGA AND CASIO 991 ES/570 ES WE OFFER ONLINE REVIEW