Vector u has an initial point at (−5, 2) and a terminal point at (−7, 9). Which of the following represents u in trigonometric form?  a u = 7.28(cos 74.055°i + sin 74.055j)  b u = 7.28(cos 105.945°i + sin 105.945°j)  c u = 7.28(sin 74.055°i + cos 74.055°j)  d u = 7.28(sin 105.945°i + cos 105.945°j)

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