Find dy/dt.y = t8(t4 + 1)4
A. t8(t4 + 1)3(24t3 + 8)
B. t7(t4 + 1)3(24t4 + 8)
C. 8t7(t4 + 1)3(16t4 + 1)
D. 128t30(t4 + 1)3
Answer: B
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that lies between the cones 
and 
A. 
?
B. 
?
C. 243?
D. 
?