The trigonometric form of complex radical 3 + I can be expressed as A.2(cosπ／6+isinπ／6） B.2(cos11π／6+isinπ11π／6） C.2(cos5π／6+isin5π／6） D.2(cos11π／6-isinπ11π／6） Which one???

The trigonometric form of complex radical 3 + I can be expressed as A.2(cosπ／6+isinπ／6） B.2(cos11π／6+isinπ11π／6） C.2(cos5π／6+isin5π／6） D.2(cos11π／6-isinπ11π／6） Which one???

-√3+i=2(-√3/2+i/2)
That is, cosa = - √ 3 / 2, Sina = 1 / 2
So a = 5 π / 6
So √ 3 + I = 2 [cos (5 π / 6) + isin (5 π / 6)]
The following complex numbers are expressed in triangular form z = cos45 ° and isin30 °
z=√2/2+i1/2
=√3/2*e^(iarctan√2/2)
1. Questioning: triangular form and process
Is the preceded by the plural of countable nouns?
Thank you~
What about common nouns~
The plural of surnames means * * family
Countable with the means that there is a certain kind of item in the surname. For example, Sun Moon's unique thing should also be added with the
( )out a piece of paper.a.bring b.take
And write the reasons,
B
Bring is never followed by out
Take out means take out
take
Take out
The can be used with countable nouns, singular and plural can also be used with uncountable nouns, right?
Can you follow me according to the situation?
Yes, you can. It depends on the situation
Please take out____ ,children.A.a piece of paper B.a piece paper C.some paper D.pieces of papers
A. A piece of paper is a piece of paper
C
A
Is the family singular or plural
complex
complex
complex
Family, plural
Singular spread
English phrases and words
Phrases: 1 and. Talk 2 read the newspaper 3 work hard 4 take pictures 5 have fun words: 6 popular 7 jokes 8 eyes (plural) 9 remember 10 noodles 11 cabbage 12 potatoes 13 dumplings
talk with 2.read newspapers 3.work hard 4.take a picture 5.enjoy yourself/ have a good time6.popular 7.joke 8.eyes 9.remember10.noodle 11.cabbage 12.potato13.dumpling
Is each followed by a noun singular or plural
Like the title,
Singular after each
For example, each one has a book
He means that everyone has something, but it needs to be followed by singular nouns. This is an English habit, just remember it
What is the word or phrase for "official" in English?
authority \ official
official
Official, official, officially recognized, officially authorized
They have got some official figures.
They got some official figures.
offical
offical