How two vectors r(t)=x(t)i+y(t)j+z(t)k and r'(t)=x'(t)i+y'(t)j+z'(t)k can

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also be order and respect? I know when: r(t).r'(t)=0 they are perpendicular but i want to know how they can also be order...
I know when: r(t).r'(t)=0 they are perpendicular but i want to know how they can also be in line...
 
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