Evaluate the expression
(
1
+
3
i
)
(
−
1
+
3
i
)
\displaystyle {\left({1}+{3}{i}\right)}{\left(-{1}+{3}{i}\right)}
(
1
+
3
i
)
(
−
1
+
3
i
)
and write the result in the form
a
+
b
i
\displaystyle {a}+{b}{i}
a
+
b
i
.
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