Find the product.(9a3 + 7c)(9a3 - 7c)
A. 9a6 - 7c2
B. 81a6 + 126a3c - 49c2
C. 81a6 - 126a3c - 49c2
D. 81a6 - 49c2
Answer: D
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Solve the problem by integration.The force F (in N) applied by a stamping machine in making a certain computer part is 
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to 
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