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8.5 Assessed Exercises 3

Solutions in tutor’s pigeonhole by 17:00 on Tuesday 6th December, please. Feedback is available from the moodle website.

A3.1. The curve x=at-asintx=at-a\sin t and y=a-acosty=a-a\cos t where t0t\geq 0 is a cycloid; this represents the motion of a point on the rim of a rotating wheel.

(i) Show that

dydx=sint1-cost=cott2.{{dy}\over{dx}}={{\sin t}\over{1-\cos t}}=\cot{{t}\over{2}}.

(ii) Show that the length along the curve from the point (x(0),y(0))=(0,0)(x(0),y(0))=(0,0) to the point (x(π),y(π))=(aπ,2a)(x(\pi),y(\pi))=(a\pi,2a) is 4a4a.

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A3.2 Find and classify the stationary points of the function given by

f(x,y)=13x3+y3+2x2-12x-3y.f(x,y)={{1}\over{3}}x^{3}+y^{3}+2x^{2}-12x-3y.

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