Calculate the derivative of the function. Then find the value of the derivative as specified.
t =1 if r = 
A. 
= - 
; 
t =1
= - 
B. 
= 
; 
t =1
= 
C. 
= - 
; 
t =1
= - 
D. 
= 
; 
t =1
= 
Answer: D
Mathematics
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3
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a. 
b. 
c. 
d. 
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