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Question
Mathematics
The real part of e(3+4 i) x is
Q. The real part of
e
(
3
+
4
i
)
x
is
1910
264
KEAM
KEAM 2020
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A
e
3
x
B
cos
7
x
C
e
3
x
cos
4
x
D
e
3
x
sin
4
x
E
0
Solution:
z
=
e
3
x
⋅
e
4
x
i
=
e
3
x
[
cos
4
x
+
i
sin
4
x
]
R
e
(
z
)
=
e
3
x
cos
4
x