a. Find, in the form r = a + b, a vector equation of the line AB

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a. Find, in the form r = a +  λb, a vector equation of the line AB where the points have coordinates A(2, 5, 7) and B(9, −1, −2).

b. Find the obtuse angle between the line AB and a line in the direction of i + 3j + 2k.

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