Complex trigonometric form The trigonometric form of complex z = - 2-2 radical 3I is

Complex trigonometric form The trigonometric form of complex z = - 2-2 radical 3I is

Complex z = - 4 (1 / 2 + radical 3 / 2I) = - 4 (cos60 + sin60i)
Triangle operation of complex number
27.5-j9.45 =? (expression of R ∠)
r = √(27.5^2 + 9.45^2 = 29.08
arg(z) = arctan(-9.45/27.5) = 2π - 0.33 = 5.95
That is 29.08 ∠ 5.95
What's the degree of the word "possibility" in English?
For example, it means 100% or 80% possible
Use words like possible, may, probably, like,
Is there any other word or phrase for "possibility"?
Objective comparison of possibility: probable, likely, possible; may has the color of someone's subjective possible will
In other words, "probable" of "probable" means that there is actual basis or logical rationality, But like often implies judging from the surface signs; probable believes that something is true or likely to happen after weighing the positive and negative reasons
① It is possible that it will rain, but with such a blue sky it doesn't seem probable
② His success is not impossible but hard probable
③ It is possible but not probable that it will rain?
It's not logical if they are interchanged. It's not logical if they are interchanged
④ It's possible but not likely / probable that he'll come here next month
⑤ It's probable, not only possible
⑥ Such accidents are not only possible but also probable
From this sentence, we can see that the meaning of possible is weaker than that of probable
It only means that it is possible, and probable means that it is very likely or likely to happen
Some and much modify countable nouns or uncountable nouns respectively
Why is it that in some books many modifiers are countable while some modifiers are not?
This is a bit of a mess,
1. Many and much, the former modifying countable nouns, the latter modifying uncountable nouns
2. Some and any can modify both countable and uncountable nouns. The former is used in affirmative sentences, while the latter is used in negative and interrogative sentences
Some is some
It can be used both countable and uncountable
such as
Some dogs
You can't count some money
Many means more
It's usually used in uncountable
much money
much more coffee
Some can modify both countable and uncountable nouns
Many can only modify uncountable nouns
Many more apples, for example
Some modifies both countable and uncountable.
Many can only modify uncountable
Explanation of BEC vocabulary
1.difficult consumers
Problem customers
Is there a countable noun after some or an uncountable noun, any?
I have some work to do this evening. Some mushrooms are poisonous
Some can be followed by countable or uncountable nouns, and any is the same, but the former is used in affirmative sentences and the latter in negative or interrogative sentences
Some can add uncountable nouns or countable nouns, for example: some apples; some wine
Any is the negative form of some, which is usually used in questions or negative sentences
Advanced vocabulary of BEC
What about any?
Will you lend me some money? (= please lend me some money.)
Business English words
There is no MP3 format business English vocabulary, the best can read out and can also say the meaning. Vocabulary in the 3-4 vocabulary bar
There is a business English section in the recommended area. It's very good. You can learn a lot about business English and get a lot of information
Can some modify uncountable nouns
There are some flowers in the vase. There is some water in the bottle