A plane flying at an altitude of a miles above a radar antenna will pass directly over the radar antenna (see figure). Letd be the ground distance from the antenna to the point directly under the plane and let x be the angle of elevation to the plane from the antenna. 
.
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(d is positive as the plane approaches the antenna.)
Write d as a function of x.
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A. d=8 csc x
B. d = 8 cot x
C. d = 8 cos x
D. d = 8 tan x
E. d = 8 sin x
Answer: B
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A. 
B. 
C. 
D. 
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A. 
B. 
C. 
D. 
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