How to calculate the polar radius What does r = 2asin θ mean?

How to calculate the polar radius What does r = 2asin θ mean?

In the above formula, R is not the radius, but the distance. R is the position of the point in polar coordinates - the point whose distance from the origin is R and whose angle with the X axis (positive direction) is θ. For example, the position of the point in plane rectangular coordinates is represented by (x, y), and the position of the point in polar coordinates is represented by R and θ. The radius of the figure (circle or arc) in R = 2asin θ formula is a

Polar coordinates of the problem. Help calculate
Find the polar coordinate equation of a circle whose center is a (3, π) and radius is 3

r=-6cosθ

The solution of one variable linear equation 0.5x + 1 = 0 is the image of linear function y = 0.5 + 1 and the abscissa of ()

The solution of one variable linear equation 0.5x + 1 = 0 is the abscissa of the image and (x-axis intersection) of the linear function y = 0.5x + 1

Given that a is a matrix of order 3 and the determinant of a is 3, the value of the determinant of the adjoint matrix of a is obtained

The value of the determinant of a * is equal to the N-1 power of the value of the determinant of A
The answer to this question is 9
AA * = 3e
So 3A * = 27, so a * = 9

The general term formula of known sequence {an} is an = (A & # 178; - 1) (n & # 178; - 2) (a ≠ ± 1), and the sequence is an increasing sequence. Try to determine the value range of constant a

Increasing sequence
a(n+1)>an
(a²-1)[(n+1)²-2]-(a²-1)(n²-2)>0
(a²-1)(2n+1)>0
n>=1
So 2n + 1 > 0
So a & # 178; - 1 > 0
a1

4x+16=6x+2

4x+16=6x+2
6x-4x=16-2
2x=14
x=7

Given the quadratic function y = x2-2x-1 (1), when x is sum value, y has the minimum value? What is the minimum value?
(2) When a (m, Y1) and B (M + 1, Y2) are both on the image of the function, try to compare the size of Y1 and Y2
I'm in a hurry!

This is a very simple ha. Y = x2-2x-1 is converted into a complete square formula. Then you should know the function image. If you look at the picture, you will know that when x = 1, y is the minimum, and the minimum is - 2

If we know that the perimeter of a square is x and its circumcircle radius is y, then the functional relation between Y and X is ()
A. y＝24xB. y＝28xC. y＝12xD. y＝22x

As shown in the figure: ∵ perimeter is x, ∵ BC = DC = x4, ∵ ∠ C = 90 °, ∵ BD is the diameter, ∵ BD is the hypotenuse of isosceles right triangle, ∵ BD = 2BC = 24x, that is, 2Y = 24x, ∵ y = 28x, so select B

It is known that ABC each represents a natural number. If a × B equals 20, B × C equals 30, and C × a equals 24, what are ABC respectively?
Urgent. To calculate!

A=4,B=5,C=6

Given a = {x | y = x ^ 2-2x-2, X ∈ r}, B = {y = x ^ 2-2x = 2, X ∈ r}, then AUB=
Given a = {x | y = x ^ 2-2x-2, X ∈ r}, B = {y = x ^ 2-2x + 2, X ∈ r}, then a ∩ B=
B={y|y=x^2-2x+2,x∈R},

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