What is the trigonometric form of complex number? What is the meaning of trigonometric form of complex number?

What is the trigonometric form of complex number? What is the meaning of trigonometric form of complex number?

a+bi=r(cosm+isinm)
rr=aa+bb
It is sometimes more convenient to calculate in trigonometric form
For example, multiplication of two complex numbers
Z1*Z2=r1(cosm+isinm)*r2(cosn+isinn)
=r1r2*(cos(m+n)+isin(m+n))
Two slices of apple a bag of apples
S. Because it's more than one
A slice of Apple doesn't need to add s, because it's a piece of apple. It must be cut from an apple
In the latter case, I think two slices of an apple may be more rigorous
A slice of apple does not need to add s, because it is an apple, it must be cut from one apple, and if two slices of apple are not cut from the same apple, it must add s
Is the plural after the noun OK
What are they doing there?
They are planting the trees
If there are many trees, I do not add s OK, is to answer the question
If you use plant the tree to denote a certain kind of tree, then this should be the tree mentioned above and specified, taking into account the context above
There is no need to add the, so it should be they are planting trees
We can add the plural number after the, here the tree refers to in general, not in particular, so we don't need to add the
What's the difference between a piece of and a slice of
A piece of is more general. A piece, a piece, a piece and so on can be represented by a piece of
A slice of
A piece of is more general. A piece, a piece, a piece and so on can be represented by a piece of
A slice of
Can plural nouns be added after the next?
RT
No, but there may be a special case. This answer is for reference only. I hope to make progress with you
take a piece of
Paper is an uncountable noun. To express the meaning of "one", it should be used with piece to form "a piece of paper"
Papers means papers, papers and materials
Take, bring, bring
Take a piece of paper with you
Take out a piece of paper
Make a test paper
Take a piece of paper
Make a test paper
Take out a piece of paper
eg:She take a piece of paper and begin to write a letter.
She took a piece of paper and began to write.
Take out a piece of paper
Take out a piece of paper
Can the plural noun be preceded by the?
sure.
1. Sometimes it refers to a special kind of people, sometimes it refers to a kind of people
The Johns are watching TV
2. It doesn't matter whether you add the or not
Add the is special, not general
no way
For example, the Great Wall
All right
If it is special, add the
The students under that tree are singing
"The" refers specifically to, or a noun that has appeared above. In the second category, the word "the" is followed by "the word" above
Yes, I'm so excited to see my picture
A piece of paper!
A piece of paper
Is the plural countable noun preceded by the special reference
yes
The plural countable noun is preceded by the
Yes, it is
When you take out a piece of paper
When you pull out a piece of paper
When do you take out a piece of paper