Explain this step on the proof of the curvature of the vector $r(t)$?
Explain this passage on the proof that the curvature of the vector function $r(t)$ is $\frac{|r'(t) \times r''(t)|}{ |r'(t)|³}$?
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multivariable-calculus
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1Which part you don't understand? – 2012-03-22
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1Differentiate $T\times T=0$ and you are done – 2012-03-22
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0I don't get it... – 2012-03-24