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thank you very much.Suppose u=f x+y ху is a differentiable function. Which equation must be true? ди ди дхду = 0 од? д?u дх2 ду? + = 0 х2. ди диSuppose the position vector is given by F(t) = = <t, t², 2) Then at time t = 1, the tangential acceleration is 3 16 0 22 O 11Suppose u = (a, b, c) and v=(4,9,-2) and u and v are orthogonal. What are possible values of a, b, and c? O a = 9, b = 4, C =

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