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If ` vec a , vec b` are two non-collinear vectors, prove that the points with position vectors ` vec a+ vec b , vec a- vec b` and ` vec a+lambda vec b` are collinear for all real values of `lambdadot`

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CENGAGE ENGLISH-VECTOR ALGEBRA-All Questions
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  17. Find the direction cosines of the vector hat i+2 hat j+3 hat kdot

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