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OpenStudy (anonymous):
so It is 0
OpenStudy (michele_laino):
hint:
2 vectors are orthogonal each other when, their scalar product is zero, namely:
\[\Large u \cdot v = \left\| u \right\|\;\left\| v \right\|\;\cos {\theta _{uv}} = 0\]
OpenStudy (nincompoop):
well you need to understand why zero
OpenStudy (anonymous):
well now I know that is definitely 0
OpenStudy (michele_laino):
being \[\Large {\theta _{uv}}\]
the angle between such vectors
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OpenStudy (nincompoop):
what you know does not matter, you need to show why it is zero
OpenStudy (anonymous):
I found the answer by finding the scalar product at first