Find the value of the indicated sum.
A. cos 4? + cos 12? = 2
B. cos 4? - cos 8? + cos 12? = - 1
C. cos 4? - cos 8? + cos 12? = 1
D. -cos 4? + cos 8? - cos 12? = -1
Answer: C
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A. 
?
B. 192?
C. 
?
D. 
?
Find the velocity vector in terms of ur and u?.r = a(4 - cos ?) and 
= 7
A. v = 7a(4 - cos ?)ur + (7a sin ?)u? B. v = (4a sin ?)ur + 4a(7 - cos ?)u? C. v = (7a cos ?)ur + 7a(4 - sin ?)u? D. v = (7a sin ?)ur + 7a(4 - cos ?)u?
Evaluate the expression.6P4
A. 2 B. 30 C. 24 D. 360
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