Evaluate the integral.
A. - 
csc 9t cot 9t - 
ln
+ C
B. 
csc 9t cot2 9t - 
ln
+ C
C. - 
csc 9t cot 9t - 
ln
+ 
+ C
D. - 
csc 9t cot 9t + 
ln
+ C
Answer: A
Mathematics
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Find the vertex, focus, and directrix of the parabola.x2 = 8y
A. vertex: (0, 0)
focus: (-2, 0)
directrix: x = 2
B. vertex: (0, 0)
focus: (2, 0)
directrix: x = -2
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focus: (0, 2)
directrix: y = -2
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focus: (0, -2)
directrix: y = 2
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Determine whether the function is a one-to-one function.
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Mathematics