Express the product as a sum containing only sines or cosines.cos (2?) cos (4?)
A. 
[cos (6?) - cos (2?)]
B. 
[cos (2?) + cos (6?)]
C. 
[cos (6?) - sin (2?)]
D. cos2 (6?2)
Answer: B
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Provide an appropriate response.Evaluate 
Fill in the blank(s) with the appropriate word(s).
Write the first five terms of the geometric sequence with the given first term a and common ratio r.a = -8; r = -4
A. -4, 32, -128, 512, -2048 B. -8, -12, -16, -20, -24 C. -8, -32, -128, 512, -2048 D. -8, 32, -128, 512, -2048
Complete the identity.sin (4?) = ?
A. cos3 ? - 3 sin2 ? cos ? B. 4 sin ? cos3 ? - 4 sin3 ? cos ? C. 1 - 8 sin2 ? cos2 ? D. 3 sin ? - 4 sin3 ?
Which research strategy involves observing naturally occurring behavior without intervening in the situation?
A. case study method B. ethnography C. naturalistic observation D. experimental research