Find the derivative of the function.y = cos5(?t - 15)
A. 
= - 5? cos4(?t - 15) sin(?t - 15)
B. 
= - 5? sin4(?t - 15)
C. 
= - 5 cos4(?t - 15) sin(?t - 15)
D. 
= 5 cos4(?t - 15)
Answer: A
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