Instructions: On occasion, the notation 
= [A, ?] will be a shorthand notation for 
.
The vector 
has components +5 and +7 along the x and y axes respectively. If the vector is now rotated 90 degrees counterclockwise relative to the original axes, the vector's components are now
A. ?7; ?5.
B. 7; ?5.
C. ?7; 5.
D. 7; 5.
E. 7; 0.
Answer: C
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