Question
If and , then show that is a real number.
If and , then show that is a real number.
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Topics and outcomes this question is testing.
Recall complex number z represented by an expression of the form z = a + ib or of the form (a, b) where a and b are real numbers and i = √−1.
Recognize a as a real part of z and b as an imaginary part of z.
Carryout basic operations on complex numbers.