Complex Numbers | engineering, mathematics | fx-991EX can help you with engineering maths! Here's how you solve complex number. Click here to find out more >>>... | By CASIO Education Singapore | Facebook
Casio Classwiz Complex Mode | Input A Complex Number And Find The Argument | Casio Calculator, 991EX - YouTube
Working with Complex Roots with a Casio Classwiz fx-991EX | Cubic Equation Solving - YouTube