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Parametric Equations

Equivalent Cartesian Equation of Parametric Equations

Problem
Find the Cartesian equation of the curve represented by $x = 4t + 3$ and $y = 16t^2 - 9$, -∞ < t < +∞.

A.   $y = x^2 + 6x$ C.   $y = x^2 + 4x$
B.   $y = x^2 - 6x$ D.   $y = x^2 - 4x$

 

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Find y’ if x = 2 arccos 2t and y = 4 arcsin 2t

Problem
Find y’ if x = 2 arccos 2t and y = 4 arcsin 2t.

A.   2 C.   4
B.   -2 D.   -4

 

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Slope of a Curve of Given Parametric Equations

Problem
A point moves in the plane according to equations x = t2 + 2t and y = 2t3 - 6t. Find dy/dx when t = 0, 2, 5.

A.   -3, -3, -12 C.   3, 3, 12
B.   3, -3, 12 D.   -3, 3, 12

 

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Cycloid: equation, length of arc, area

Problem
A circle of radius r rolls along a horizontal line without skidding.

  1. Find the equation traced by a point on the circumference of the circle.
  2. Determine the length of one arc of the curve.
  3. Calculate the area bounded by one arc of the curve and the horizontal line.
cycloid_small_02.gif

 

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