FP1.1.1 - Definition of complex numbers

Definition of complex numbers in The meaning of conjugate, modulus, argument, real part, the form a + ib and imaginary part and equality of complex numbers should be known. rcos θ + irsin θ.

Use fp1.1.1 - definition of complex numbers to connect the rule to the data and decision in the question.

This matters because fp1.1.1 - definition of complex numbers determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply fp1.1.1 - definition of complex numbers to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: FP1.1.1 - Definition of complex numbers is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.