Find the curvature of the plane curve given by r(t) = (3cost)i + (3sint)j at the point (√(2), √(7) ).(adsbygoogle = window.adsbygoogle || []).push({});

I know that κ=|r'(t) x r"(t)| / |r'(t)|^3

However, I believe that you are not allowed to do cross product unless there is an x, y, and z component and this question only has an x and y component.

In this case, am I supposed to use κ= |T'(t)/r'(t)| instead or use another formula all together?

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# Find the curvature of the plane curve given by r(t) = (3cost)i + (3sint)j at the poin

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