Polar coordinate equation ρ = 3 / (1 + cos θ) is transformed into rectangular coordinate equation

Polar coordinate equation ρ = 3 / (1 + cos θ) is transformed into rectangular coordinate equation

The original formula can be changed to P (1 + cos θ) = 3
p+pCOSθ=3
p+x=3
p=3-x
p^2=(3-x)^2
x^2+y^2=x^2-6x+9
So y ^ 2 = - 6x + 9
Do you understand~
The interchange between rectangular coordinates and polar coordinates, remember to grasp the definition~
Curves represented by polar coordinate equation ρ = 16 / 2-sin θ
According to ρ = EP / (1-cos θ) ρ = 16 / (2-sin θ) ρ = (16 / 2) / ((2-sin θ) / 2) ρ = (16 / 2) / (1-1 / 2Sin θ) ρ = (16 / 2) / (1-1 / 2cos (θ - π / 2)) (regarding (θ - π / 2) as θ ', we can solve the problem corresponding to ρ = EP / (1-cos θ)), e = 1 / 2 polar coordinates
ρ=16/(2-sinθ)
2ρ-ρsinθ=16
2√(x^2+y^2) -y=16
4x^2+4y^2=y^2-32y+256
4x^2+3y^2+32y-256=0
What graph does the polar equation P = a (1 + sin θ) represent
On the axis of the image, ρ ^ 2 & nbsp; + 0.5sin & nbsp; - 2,
As shown in the figure, P max is 2|a |, passing through the origin, intersecting with the polar axis at (a, 0), (a, π)
The Management Office of the ancient city needs to redecorate the stage for the performance. If the area of the stage is 100 (square), and the floor is paved with 0.8m square bricks, is 150 enough? And the process and formula are given
An area of 0.8 × 0.8 = 0.64 square meters
64 = 0
So it's not enough
0.8 × 0.8 × 150 = 96 (M2)
Ninety-six
Xiaoqiang and Xiaogang are making flowers. Xiaoqiang makes 16 more flowers than Xiaogang. Xiaoqiang makes three times as many flowers as Xiaogang. How many flowers do Xiaoqiang and Xiaogang make respectively? (equation solution)
Let Xiaoqiang do X,
Because Xiaoqiang made 16 more than Xiaogang,
Xiaogang made (x-16)
In addition, Xiaoqiang makes three times as many flowers as Xiaogang
Then, 3 (x-16) = X
I.e. 3x-48 = x
The solution is: x = 24
A: Xiaoqiang made 24 flowers, Xiaogang made 8
Xiaoqiang x Xiaogang y
X-Y=16
3Y=X
Solution
Xiaoqiang 24 Xiaogang 8
Let's have X small ones,
X+16=3X
2X=16
X=8
3X=24
So Xiaogang made 8, Xiaoqiang made 24.
Set Xiaogang to be x
3X=X+16
X=8
Then Xiaogang 8, Xiaoqiang 24
What is one horsepower equal to
1 HP = 735 w
How much is the instantaneous voltage and current in the starting motor when the motorcycle is ignited?
The rated voltage of the starting motor is 12V. The current is about 30A. Due to the large current, the internal resistance of the battery and the voltage drop of the line are quite large, so the actual working voltage of the motor is about 1-3v lower than that of the battery. The details are also related to the vehicle type
A tractor needs to plough 45 hectares of land. It has already ploughed 20 hectares. How many parts of this land have been ploughed? How many parts of this land are left uncultivated
20 △ 45 = 4 / 9.1-4 / 9 = 5 / 9 answer: 4 / 9 have been ploughed, and 5 / 9 have not been ploughed
Xiaogang said: I collected 40 more stamps than Xiaoqiang. Xiaoqiang said: I collected dozens of stamps, 3 / 8 of Xiaogang's. how many stamps do Xiaogang and Xiaoqiang collect? Use the equation
One thousand watt hours of electricity can make a 220 volt, 100 watt lamp work at rated voltage for several hours
Ten hours
1000 W * H / 100 W = 10 h