Calculate the unit vector u = (cos ?)i + (sin ?)j for the given direction angle.? = 
A. 
i - 
j
B. - 
i + 
j
C. 
i + 
j
D. - 
i - 
j
Answer: B
Mathematics
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?
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A. Symmetric with respect to the polar axis B. May or may not be symmetric with respect to the polar axis
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The equation is in the form y = mx + b. Identify m and b.y = 15
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