Thymocytes start as
a. double negative, become CD4 positive, then may become double negative again, become CD8 positive, and then can become double positive
b. double negative, become CD8 positive, then may become double negative again, become CD4 positive, and then can become double positive
c. double negative, become double positive, and then become either CD4 positive or CD8 positive
d. none of the above
c. double negative, become double positive, and then become either CD4 positive or CD8 positive
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What is the definition of the cotangent function?
A. 
B. 
C. 
D. 