Question: Need help with this question pls and thank you!!! Given a = [4, -2, 1] and b = [-3, 3, 5]: a) Calculate the angle

Need help with this question pls and thank you!!!

Need help with this question pls and thank you!!!
Given a = [4, -2, 1] and b = [-3, 3, 5]: a) Calculate the angle between a and b. b) If c = [5, 6, t], find t so that a and c are perpendicular

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