Find the derivative.s = t7 cos t - 6t sin t - 6 cos t
A. 
= - 7t6 sin t - 6 cos t + 6 sin t
B. 
= - t7 sin t + 7t6 cos t - 6t cos t
C. 
= t7 sin t - 7t6 cos t + 6t cos t
D. 
= - t7 sin t + 7t6 cos t - 6t cos t - 12 sin t
Answer: B
Mathematics
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