Example finding components of a vector

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Example finding components of a vector
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"SAL" you save my feuture in mathematics "from Morocco" جزاك الله خيرا

tahaanouar
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I'd like to know: How can I prove that if each component of a non-zero vector in R3 is trippled then the length of that vector is also trippled? Thanks in advance

samtony
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damn is this casual, we just had about it at school and was wondering exactly how to solve this problem....

AmmA