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AP EAPCET 19-Aug-2021 Shift 1 Paper
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© examsnet.com
Question : 11
Total: 160
Real part of
(
cos
4
+
i
sin
4
+
1
)
2020
is _______
2
2020
cos
2020
2
cos
2020
2
2020
cos
2020
2
cos
4040
2
1020
cos
2020
2
cos
4040
2
2020
cos
2020
1
cos
2020
Validate
Solution:
Real part of
(
cos
4
+
i
sin
4
+
1
)
2020
=
Real part
of
(
2
cos
2
2
+
i
2
sin
2
cos
2
)
2020
= Real part of
2
2020
cos
2020
(
2
)
(
cos
2
+
i
sin
2
)
2020
= Real part of
2
2020
cos
2020
(
2
)
(
cos
4040
+
i
sin
4040
)
=
2
2020
cos
2020
2
.
cos
4040
[
z
+
z
=
2
Re
(
z
)
]
© examsnet.com
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