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Never-mind, I found the problem.

Quote: Originally Posted by elitethut Hi everyone ! I want to solve the following: $\displaystyle 1/4||\vec{u}+\vec{v}||^2-1/4||\vec{u}-\vec{v}||^2=\vec{u} \cdot \vec{v}$ I have no idea how to start this proof...anyone can help ?? Thanks ! Definition: $\displaystyle ||\vec{u}||^2:=\vec{u}\cdot \vec{u}$, so now you have an idea how to begin here. Tonio

Quote: Originally Posted by elitethut Hi everyone ! I want to solve the following: $\displaystyle 1/4||\vec{u}+\vec{v}||^2-1/4||\vec{u}-\vec{v}||^2=\vec{u} \cdot \vec{v}$ I have no idea how to start this proof...anyone can help ?? Thanks ! Nevermind. I think I goofed.