The principal value of arg z zl of the complex
(1 + cos+ i sino) 5
Z=
(cos+ i sino)3
are
Answers
Answered by
1
Step-by-step explanation:
ANSWER
z=1+cos(
9
11π
)+sin(
9
11π
)
=2cos
2
(
18
11π
)+i×2sin(
18
11π
)cos(
18
11π
)
=2cos(
18
11π
)[cos
18
11π
+isin
18
11π
]
⇒∣z∣=2cos(
18
11π
)
⇒180°<
18
11π
<270°
∴ Principle argument is
18
11π
−π=
18
−7π
Hence, the answer is
18
−7π
,2cos(
18
11π
).
Answered by
1
Answer:
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