Calculating Polar Curve Length with Period of 3π: r = psin3(θ/3)

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SUMMARY

The discussion focuses on calculating the length of the polar curve defined by the equation r = psin3(θ/3) over the interval 0 ≤ θ ≤ 3π. The formula for the length of a polar curve, L = ∫sqrt(f(θ)² + f'(θ)²)dθ, is emphasized as essential for this calculation. Participants agree that "p" should be treated as a constant, as its variability would prevent the equation from defining a proper curve. This conclusion is critical for correctly applying the length formula to the given polar equation.

PREREQUISITES
  • Understanding of polar coordinates and polar curves
  • Familiarity with calculus, specifically integration techniques
  • Knowledge of derivatives and their application in polar equations
  • Ability to interpret and manipulate mathematical constants in equations
NEXT STEPS
  • Study the derivation and application of the polar curve length formula
  • Explore examples of polar curves with varying constants
  • Learn about the implications of treating variables as constants in mathematical equations
  • Investigate the graphical representation of polar curves and their properties
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Students in calculus, mathematics educators, and anyone interested in the geometric properties of polar curves and their applications in real-world scenarios.

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Homework Statement


Find the length of the polar curve r = psin3([tex]\theta[/tex]/3)
Hint: The period of the curve is 3[tex]\pi[/tex]

Homework Equations


L = [tex]\int[/tex]sqrt(f([tex]\theta[/tex])2 + f'([tex]\theta[/tex])2)d[tex]\theta[/tex]

The Attempt at a Solution


I know from the hint that 0[tex]\leq[/tex][tex]\theta[/tex][tex]\geq[/tex]3[tex]\pi[/tex]

The only problem I have is how do I start this with "p" in the r-equation. Do I treat it as another variable or is it a constant?
 
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I would treat p as a constant, you're not given necessary information to solve the problem if it were not.
 
If p were not a constant, the equation would not define a curve.
 

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