A small but important additionI know that for 2 vectors to be perpendicular their dot-product must equal zero
Hint: If [imath]|| \textbf{x} + \textbf{y} || = || \textbf{x} - \textbf{y} ||[/imath] then [imath]\sqrt{ (\textbf{x} + \textbf{y}) \cdot (\textbf{x} + \textbf{y}) } = \sqrt{ (\textbf{x} - \textbf{y}) \cdot (\textbf{x} - \textbf{y}) }[/imath].Hello. I’m stuck on this question (6). I know that for 2 vectors to be perpendicular their product must equal zero and the angle between them is 90 degrees. But how can I prove this without having values and only lengths? Can anyone help? Thanks ? View attachment 33176View attachment 33177