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The complex conjugate of a+bi is a-bi.

This is written as z* where z is a complex number.

ex.

z = a+bi

z* = a-bi

r = 3+12i

r* = 3-12i

s = 5-6i

s* = 5+6i

t = -3+7i = 7i-3

t* = -3-7i = -(3+7i)

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