The mach number M of an airplane is the ratio of its speed to the speed of sound. When an airplane travels faster than the speed of sound, the sound waves form a cone behind the airplane (see figure). The mach number is related to the apex angle ? of the cone by 
.
?
?
Rewrite the equation in terms of ?.
?
A. ?
B. ?
C. ?
D. ?
E. 
Answer: E
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