- Question:
- Given
*β*=*x*^{2}d*x*+*x**y*d*y*+*x**z*d*z*, evaluate*β*at (*x*,*y*,*z*) = (4, 3, −2). - Answer:
- 16 d
*x*+ 12 d*y*− 8 d*z*.

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