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sqdancefan

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Answer:

  A)  63.43°

Step-by-step explanation:

The two vectors in polar form are ...

  u = (√(9²+6²))∠arctan(-6/9) = √117∠-33.69°

  v = (√(7²+4²))∠arctan(4/7) = √65∠29.74°

The angle between the two vectors is ...

  29.74° -(-33.69°) = 63.49°

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