Calculate the arc length of the indicated portion of the curve r(t).r(t) = (5t sin t + 5 cos t)i  + (5 t cos t - 5 sin t)j ; -1 ? t ? 4

A. 75
B. 37.5
C. 42.5
D. 85


Answer: B

Mathematics

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A. - 

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D.

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