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8. Which of the following is a unit vector: A.) i+j B. cos¢i-sin¢j C.) sin¢i+2cos¢j D.) 1/\sqrt{}3(i+j) Why?

Answer» 8. Which of the following is a unit vector: A.) i+j B. cos¢i-sin¢j C.) sin¢i+2cos¢j D.) 1/\sqrt{}3(i+j) Why?


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