A-Level CAIE Mathematics A2 3.9.1—Complex numbers Question Bank

• understand the idea of a complex number, recall the meaning of the terms real part, imaginary part, modulus, argument, conjugate, and use the fact that two complex numbers are equal if and only if both real and imaginary parts are equal Notations Re z, Im z, |z|, arg z, z* should be known. The argument of a complex number will usually refer to an angle i such that 1 G-rr i, but in some cases the interval 02 1G ri may be more convenient. Answers may use either interval unless the question specifies otherwise.