Given r = 6 cos θ 2 , a. Replace r , θ by r , π − θ in the equation. Does this show that the graph of the equation is symmetric with respect to the line θ = π 2 ? b. The ordered pair − r , 2 π − θ is another representation of the point r , π − θ . Replace r , θ by − r , 2 π − θ in the equation. Does this show that the graph of the equationis symmetric with respect to the line θ = π 2 ? c. What other type of symmetry (if any) does the graph of the equation have? d. Use a graphing utility to graph the equation on a graphing utility for 0 ≤ θ ≤ 4 π .
Given r = 6 cos θ 2 , a. Replace r , θ by r , π − θ in the equation. Does this show that the graph of the equation is symmetric with respect to the line θ = π 2 ? b. The ordered pair − r , 2 π − θ is another representation of the point r , π − θ . Replace r , θ by − r , 2 π − θ in the equation. Does this show that the graph of the equationis symmetric with respect to the line θ = π 2 ? c. What other type of symmetry (if any) does the graph of the equation have? d. Use a graphing utility to graph the equation on a graphing utility for 0 ≤ θ ≤ 4 π .
Solution Summary: The author analyzes the graph of the polar equation r=6mathrmcostheta 2.
a. Replace
r
,
θ
by
r
,
π
−
θ
in the equation. Does this show that the graph of the equation is symmetric with respect to the line
θ
=
π
2
?
b. The ordered pair
−
r
,
2
π
−
θ
is another representation of the point
r
,
π
−
θ
. Replace
r
,
θ
by
−
r
,
2
π
−
θ
in the equation. Does this show that the graph of the equationis symmetric with respect to the line
θ
=
π
2
?
c. What other type of symmetry (if any) does the graph of the equation have?
d. Use a graphing utility to graph the equation on a graphing utility for
0
≤
θ
≤
4
π
.
1. Find an equation of a line through the point (-1,4) making an angle of radian measure 1/4 with the linehaving an equation 2x+y-5=0.a. 3x + y + 1 = 0, x + 2y - 7 =0b. 3x - y + 1 = 0, x + 3y - 11 =0c. 2x - 3y - 14 = 0, x + 3y - 11 = 0d. 2x - 3y + 14 = 0, x + 3y - 11 =0
2. Find the polar equation of the circle with radius 3/2 and the center in polar coordinates at (3/2,π).
3. Find the angle between the lines AB and CD, where A: (2,-4,3), B: (-1,3,-2), C: (5,-2,1), D: (4,1,6). a. 90 b. 91.06 c. 81.05 d. 85.5
4. Find the angle between the planes 4x-2y+6z+15=0 and 15x+10y-5z-27=0.a. 82◦b. 83◦57′c. 85◦54′d. 87◦54′
Convert each Rectangular coordinate into two distinct Polar coordinates (r, 0) each.
(Use degree)
A. (-1,1)
B. (0, -3)
C. (-√3,-1)
D. (2.5, 5)
:: (0, 45")
(1.41, 135)
:: (5.59, 63°) :: (3, 90°) :: (2, 30°) = (0, 180°)
:: (1.65, 30°) :: (2, 210")
:: (3, 270°)
A height of a rider on a Ferris wheel can be modeled using a sinusoidal function. The rider's height, h in meters,
above ground vs time, t in seconds, can be described using the equation h = -16 cos(6t) + 18
11.
a) Graph the rider's height above the ground
during a 3-minute ride.
b) Determine the height of the rider after 110 s.
The Ferris Wheel
40
36
32
c) During the 3-minute ride, how long is the rider at or
28
above 26 m?
24
20
16
12
4.
30
60
90
120
150
180
Time (seconds)
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