Find r'(t), r"(t), r'(t) ・r"(t), and r'(t) × r"(t). r(t) = 클레 - 3tj + (a) r'(t) (b) r"(t) (c) r'(t).r"(t) x x x (d) r'(t) × r"(t) 름다

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