Evaluate the line integral along the curve C.
ds , C is the path given by:C1: r(t) = (9 cos t)i + (9 sin t)j from (9, 0, 0) to (0, 9, 0)C2: r(t) = (9 sin t)j + (9 cos t)k from (0, 9, 0) to (0, 0, 9)C3: r(t) = (9 sin t)i + (9 cos t)k from (0, 0, 9) to (9, 0, 0)
A. 
B. 
?
C. - 
?
D. 0
Answer: A
Mathematics
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