The inclination angle of the straight line x = 3-tcos20 ° y = Tsin (- 20 °) (t is not a parameter) is ()? （） 20 ° 160 ° a or B?

The inclination angle of the straight line x = 3-tcos20 ° y = Tsin (- 20 °) (t is not a parameter) is ()? （） 20 ° 160 ° a or B?

x=3-tcos20° ①
y=tsin(-20°) ②
②：t=-y/sin20
Substituting (1)
x=3+ycos20/sin20
Shift x-3 = y (cos20 / sin20)
sin20/cos20(x-3)=y
y=tan20(x-3)
Inclination angle: tan20
Select a: 20 degree

374-3/4-1/4*5
It should be simple

374-3/4-1/4*5
=374-（3/4+5/4）
=374-2
=372

Q: let p be a prime, and the two integers of the equation x & # 178; - px-580p = 0 are integers, then p =?
Answer: both are integers,
Then the discriminant = P & # 178; + 2320p = P (P + 2320) is a complete square number,
So p + 2320 divided by P is a perfect square,
(p+2320)/p=1+2320/p=a²,
So p is the prime factor of 2320,
So p = 2,5,29
When p = 29, P + 2320 divided by P is a complete square,
So p = 29, why is it that (P + 2320) / P is a complete square after the second step?

P (P + 2320) is a perfect square,
p(p+2320)=m²
Then p is a divisor of M
Divide both sides by P & # 178;
(p+2320)/p=(m/p)²
Here M / P is an integer
So (P + 2320) / P is a perfect square

I asked all the questions around me, about salary, dizzy mathematics,
I really ran into this problem. In order to make the calculation simple, I looked clear and rounded up
I used to pay 4000 yuan a month from the 10th of last month to the 10th of this month
That is to say, the salary from February 10 to March 10 will be 4000 on March 10
Then the personnel said to change the algorithm, calculate the salary from the 1st to the 30th of last month
So far, so clear
Then on April 10th, I got a salary of 2000 yuan last month
Why? I've been working for one month. Why is it 2000 yuan,
And I'm going to ask the personnel department if I can get 4000 next month,
Where did my 2000 go, where did it go, where did it go
As a liberal arts student, I really have a big head
The master who spoke very clearly offered a lot of rewards