Rewrite the trigonometric expression as an algebraic expression involving the variable u. Assume that 
and that the value of the "inner" inverse trigonometric expression represents an angle ? such that 
tan (csc-1 u)
A. 
B. 
C. 
D. 
Answer: C
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For the given rectangular equation, write an equivalent polar equation.y = 12
A. r = 12 sin ? B. r = 12 cos ? C. r = 12 csc ? D. r = 12 sec ?
Solve the problem.Assume that the temperature of a person during an illness is given by 
for 
where T is the temperature (°F) at time t, in days. Sketch the graph of the function. Find the maximum temperature and the time at which it occurs. 
A. 
Maximum temperature is 101.6°F;
occurs after 7.5 days
B. 
Maximum temperature is 101.6°F;
occurs after 5.5 days
C. 
Maximum temperature is 98.6°F;
occurs after 11 days
D. 
Maximum temperature is 102.6°F;
occurs after 5.5 days
In work with alternating current, complex numbers are used to describe current I, voltage E, and impedance Z. These three quantities are related by the equation E = IZ. Solve the equation E = IZ for the missing variable.Z = 9 + 4i, E = 25 + 48i
A. I = 
+ 
i
B. I = 
+ 
i
C. I = 
+ 
i
D. I = 
+ 
i
Simplify.
+ 
A. 
B. 
C. 
D. 