Complete the identity.tan4 ? - sec4 ? = ?
A. sec2 ?
B. tan 2 ? - sec2 ?
C. -2 tan2 ? - 1
D. sec2 ? + tan2 ?
Answer: C
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Find the intervals on which the function is continuous.y = 
A. continuous on the interval [
, ?)
B. continuous on the interval [-
, 
]
C. continuous everywhere
D. continuous on the intervals (-?, -
] and [
, ?)
Find a rectangular equation for the curve with the given parametric equations.x = sec t, y = tan t; for t in [0, 2?]
A. y2 - x2 = 1 B. x2 - y2 = 1 C. y = x - 1 D. y = x + 1
Select the correct graph of the polar equation. Find an interval for 
for which the graph is traced only once.
?
?
A. ?
B. ?
C. ?
D. ?
E. ?
The table shows the relationship between the number of medical devices produced by a small company each day and the company's profit for that day. Plot the points and connect them to graph the underlying function.
How many devices should be made each day to maximize profit?
A. 22 B. 35 C. Information not available D. 20