ооо Determine which of the following pairs of vectors are orthogonal a=(2, 3, 1), b = <3, 1, -9) a= (5, 5.-7), b = (9.-3, 1) a = (-4, 4), b = (7,−9) a = --8i +4j, b = 4j +8k a = -9k, b = j +5k Calculate the angle between a and b (correct to the nearest degree). a=i+2j, b=-7j+k 55° 28° 18° 38° ☐ None of these

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