Find the points of intersection of the graphs of the equations. (Enter (0, 0) for the pole.)r = 8 + 8 cos(𝜃)r = 8 − 8 sin(𝜃)r ≥ 0, 0 ≤ 𝜃 < 2𝜋
Question
Find the points of intersection of the graphs of the equations.
(Enter (0, 0) for the pole.)
Solution
To find the points of intersection of the two polar equations, we need to set them equal to each other and solve for 𝜃.
So, we have:
8 + 8 cos(𝜃) = 8 - 8 sin(𝜃)
Rearranging the equation gives:
8 cos(𝜃) + 8 sin(𝜃) = 0
Dividing by 8:
cos(𝜃) + sin(𝜃) = 0
This equation is satisfied when 𝜃 = 3𝜋/4 and 𝜃 = 7𝜋/4.
Substituting 𝜃 = 3𝜋/4 into the first equation gives:
r = 8 + 8 cos(3𝜋/4) = 8 - 8 sqrt(2)/2 = 8 - 4 sqrt(2)
Substituting 𝜃 = 7𝜋/4 into the first equation gives:
r = 8 + 8 cos(7𝜋/4) = 8 + 8 sqrt(2)/2 = 8 + 4 sqrt(2)
So, the points of intersection are (8 - 4 sqrt(2), 3𝜋/4) and (8 + 4 sqrt(2), 7𝜋/4).
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