Express the sum or difference as a product of sines and/or cosines.cos 
+ cos 
A. 2 cos (2?) cos 
B. 2 cos (2?)
C. 2 sin (2?) sin ?
D. 2 sin (2?) sin 
Answer: A
Mathematics
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Simplify the expression by combining like terms.2b + 2a + 3c - 5b - 5a
A. -3a - 3b B. -3a - 3b + 3c C. -3a - 3b + 3c D. 7a - 3b + 3c
Mathematics
Perform the conversion. Round to the nearest hundredth when necessary.68.3 m to yd
A. 224.02 yd B. 74.45 yd C. 62.43 yd D. 20.83 yd
Mathematics
Decide whether or not the equation has a circle as its graph. If it does not, describe the graph.2x2 + 2y2 + 16x - 4y + 26 = 0
A. no; the graph is the point (4, -1) B. yes C. no; the graph is the point (-4, 1) D. no; the graph is nonexistent
Mathematics
Find the missing number.
= 6x
A. -6x B. 36x C. 6x2 D. 36x2
Mathematics