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Deriving parametric equations of a point for the involute of a circle
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[QUOTE="JoeSabs, post: 1895680, member: 145936"] [h2]Homework Statement [/h2] If a string wound around a fixed circle is unwound while held taut in the plane of the circle, its end P traces an involute of the circle. In the accompanying figure, the circle in question is the circle (x^2)+(y^2)=1 and the tracing point starts at (1,0). The unwound portion of the string is tangent to the circle at Q, and t is the radian measure of the angle from the positive x-axis to segment OQ. Derive the parametric equations x=cost+tsint, y=sint-tcost, t>0 of the point P(x,y) for the involute. [h2]Homework Equations[/h2] ? [h2]The Attempt at a Solution[/h2] I have no idea how to do this problem! The section it's in is "Arc length and the unit-Tangent vector," but the only things explained in the section are arc length and unit tangent vector! I don't see how this relates... If anyone can provide a detailed explanation, I'd be grateful. [/QUOTE]
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Deriving parametric equations of a point for the involute of a circle
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