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KEAM 2020 Math Paper
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© examsnet.com
Question : 8
Total: 120
The real part of
e
(
3
+
4
i
)
x
is
e
3
x
cos
7
x
e
3
x
cos
4
x
e
3
x
sin
4
x
0
Validate
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
© examsnet.com
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