Finding Points of Intersection for r = 1 - cos θ and r = 1 + sin θ

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SUMMARY

The discussion focuses on finding the points of intersection for the polar equations r = 1 - cos θ and r = 1 + sin θ. The solution begins with setting the two equations equal, leading to the equation 0 = sin θ + cos θ. This simplifies to sin θ = -cos θ, which can be further analyzed by dividing both sides by cos θ. The intersection points can be determined by solving for θ in this context.

PREREQUISITES
  • Understanding of polar coordinates and equations
  • Knowledge of trigonometric identities and equations
  • Ability to manipulate algebraic equations
  • Familiarity with solving for angles in trigonometric contexts
NEXT STEPS
  • Explore the implications of sin θ = -cos θ in polar coordinates
  • Learn how to convert polar equations to Cartesian coordinates
  • Study the graphical representation of polar curves
  • Investigate additional methods for finding intersections of polar curves
USEFUL FOR

Students studying calculus, particularly those focusing on polar coordinates, as well as educators looking for examples of solving intersection problems in trigonometry.

JRangel42
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Homework Statement



Find all points of intersection of the given curve.

Homework Equations



r = 1 - cos θ, r = 1 + sin θ

The Attempt at a Solution



1 - cos θ = 1 + sin θ
1 = 1 + sin θ + cos θ
0 = sin θ + cos θ

After that step, I blank out and can't think about how to get any further on just looking for θ = ?
 
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JRangel42 said:

Homework Statement



Find all points of intersection of the given curve.

Homework Equations



r = 1 - cos θ, r = 1 + sin θ

The Attempt at a Solution



1 - cos θ = 1 + sin θ
1 = 1 + sin θ + cos θ
0 = sin θ + cos θ

After that step, I blank out and can't think about how to get any further on just looking for θ = ?
So sinθ = -cosθ.

What if you divide both sides by cosθ?
 
I just figured that out, too. Thanks for confirming my answer though.
 

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