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Problems
Problem
Problem
Solve
sin
x
+
i
cos
x
1
+
i
\frac{\sin x + i \cos x}{1 + i}
1
+
i
s
i
n
x
+
i
c
o
s
x
,
i
=
−
1
i = \sqrt{-1}
i
=
−
1
when it is purely imaginary.
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