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  1. AP Calculus
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How do you find the intersection points of two polar curves?

Set the two polar equations equal to each other, r1(θ)=r2(θ)r_1(\theta) = r_2(\theta)r1​(θ)=r2​(θ), and solve for θ\thetaθ. These θ\thetaθ values are the angles at the intersection points.

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How do you find the intersection points of two polar curves?

Set the two polar equations equal to each other, r1(θ)=r2(θ)r_1(\theta) = r_2(\theta)r1​(θ)=r2​(θ), and solve for θ\thetaθ. These θ\thetaθ values are the angles at the intersection points.

Outline the steps to find the area between r=3r = 3r=3 and r=3−2sin⁡(2θ)r = 3 - 2\sin(2\theta)r=3−2sin(2θ) in the second quadrant.

  1. Identify r1=3r_1 = 3r1​=3 and r2=3−2sin⁡(2θ)r_2 = 3 - 2\sin(2\theta)r2​=3−2sin(2θ). 2. Determine bounds: π2\frac{\pi}{2}2π​ to π\piπ. 3. Set up the integral: A=12∫π2π[(3−2sin⁡(2θ))2−32]dθA = \frac{1}{2} \int_{\frac{\pi}{2}}^{\pi} [(3 - 2\sin(2\theta))^2 - 3^2] d\thetaA=21​∫2π​π​[(3−2sin(2θ))2−32]dθ. 4. Evaluate the integral.

How do you determine which polar function is the 'inner' function?

Imagine yourself at the origin. The function you see first is the inner function.

Explain the concept of 'inner' and 'outer' radius when finding the area between two polar curves.

The 'outer' radius, r2r_2r2​, is the curve farther from the origin, while the 'inner' radius, r1r_1r1​, is the curve closer to the origin. The area is calculated by integrating the difference of their squares.

How do you determine the limits of integration when finding the area between two polar curves?

The limits of integration, aaa and bbb, are the angles at which the two polar curves intersect. Solve r1(θ)=r2(θ)r_1(\theta) = r_2(\theta)r1​(θ)=r2​(θ) to find these intersection points.

Why do we use 12r2dθ\frac{1}{2}r^2 d\theta21​r2dθ to find area in polar coordinates?

It represents the area of an infinitesimally small sector of a circle with radius rrr and angle dθd\thetadθ. Integrating this gives the total area.

What is the formula for the area of a region bounded by a single polar curve?

A=12∫abr2dθA = \frac{1}{2} \int_a^b r^2 d\thetaA=21​∫ab​r2dθ

What is the formula for the area of a region bounded by two polar curves?

A=12∫ab(r22−r12)dθA = \frac{1}{2} \int_a^b (r_2^2 - r_1^2) d\thetaA=21​∫ab​(r22​−r12​)dθ, where r2r_2r2​ is the outer radius and r1r_1r1​ is the inner radius.

How do you find the area between two polar curves?

A=12∫αβ[f(θ)2−g(θ)2]dθA = \frac{1}{2} \int_{\alpha}^{\beta} [f(\theta)^2 - g(\theta)^2] d\thetaA=21​∫αβ​[f(θ)2−g(θ)2]dθ, where f(θ)f(\theta)f(θ) is the outer curve and g(θ)g(\theta)g(θ) is the inner curve.