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MIT 18.02 Multivariable Calculus, Fall 2007 10 Online
OpenStudy (anonymous):

Any ideas on this proof?

OpenStudy (anonymous):

\[ u/\left| u \right|^2-v/\left| v \right|^2=u/\left| u \right|\left| v \right|-v/\left| u \left| v \right| \right| \]

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