Find the derivative of the function.y = cot (2x - 5)
A. 
= -2 csc2(2x - 5)
B. 
= - csc2(2x - 5)
C. 
= 2 cot (2x - 5) csc (2x - 5)
D. 
= -2 sec2(2x - 5)
Answer: A
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A. 6
B. 7
C. 5
D. 6
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A. x = 
B. x = - 
, x = 
C. x = 
D. x = 
In 
, radius 
chord 
style="vertical-align:-2px;" /> at point C. If OD = 5 and AB = 8, find OC.
A. 3
B. 3.5
C. 
D. 4
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B. 
C. 
D. 