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    Vectors, Dot Products and Orthogonality

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    3. Two vectors Xand Y are said to be orthogonal (perpendicular) if the angle between them is r/2.
    (a) Prove that X and V are orthogonal if and only if X . Y = 0.
    Use part (a) to determine if the following vectors are orthogonal.
    (b) X =(?6,4.2) and Y =(6,5,8)
    (c) X=(?4,8,3) and Y=(2,5,16)
    (d) X = (?5. 7, 2) and Y = (4, 1, 6)
    (e) Find two different vectors that are orthogonal to X = (1, 2, ?5).

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    https://brainmass.com/math/vector-calculus/vectors-dot-products-orthogonality-44705

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