I wasnt really sure if I should post that question here since I actually didnt understand its math part.(adsbygoogle = window.adsbygoogle || []).push({});

this question actually already has its solution but I didnt understand this part, when I want to find the work done by a force along a quarter circle path, I define x and y with r and angle and which is for the first quarter of circle is x= r.cos(teta) and y=r.sin(teta) when it is the second quarter of the circle why the book took the x=rsin(teta) and y=r(1-cos(teta)) ?

do you have any idea?

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# Homework Help: Work done along a quarter circle path

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