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Calculus 3 Please help me this problems and also write the numbers of each question 8. DETAILS SCALCET9 12.3.027. Find a unit vector that is

Calculus 3

Please help me this problems and also write the numbers of each question

image text in transcribedimage text in transcribed
8. DETAILS SCALCET9 12.3.027. Find a unit vector that is orthogonal to both i + j and i + k.7. DETAILS SCALCET9 12.3.018. Find the angle between the vectors. (First find an exact expression and then approximate to the nearest degree.) a = (-1, 4, 7), b = (5, 3, 1) exact approximate

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