Use identities to find the exact value of the expression.cos 20° sec 20°
A. 20
B. 1
C. -1
D. 0
Answer: B
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The eccentricity is given of a conic section with one focus at the origin, along with the directrix corresponding to that focus. Find a polar equation for the conic section. e = 
, y = -8
A. r = 
B. r = 
C. r = 
D. r = 
Use the given information to find the exact value of the trigonometric function.cos ? = - 
; The terminal side of ? lies in Quadrant III.
Find cos 
.
A. - 
B. - 
C. 
D. 
Provide an appropriate response.The graph of a quadratic function 
is shown in the standard viewing window, without x-axis tick marks. Which one of the following sets could possibly be the solution set for f(x) = 0?
A. {-2, -4} B. {-4, 2} C. {-2, 4} D. {2, 4}
Simplify. Write your answer in the form a + bi, where a and b are real numbers.(-5 - 6i) + (9 + 4i)
A. 4 + 2i B. 9 + 2i C. 9 - 2i D. 4 - 2i