Write the product as a sum or difference containing only sines or cosines.cos(3?) cos(5?)
A. 
[cos(8?) - sin(2?)]
B. 
[cos(2?) + cos(8?)]
C. cos2(11?2)
D. 
[cos(8?) - cos(2?)]
Answer: B
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Solve the problem.The tooth geometry for a particular saw blade is modeled by the following functional relationship between the tooth height, f(x), relative to an imaginary flat edge, and the distance, x, along that reference edge:
Find ao, three nonzero cosine terms (if they exist), and three nonzero sine terms (if they exist) of the Fourier series for this geometrical definition.
A. f(x) = 1 - 
B. f(x) = 1 + 
C. f(x) = 1 + 
D. f(x) = 1 - 
Use quotient identities to find the indicated function value.cos ? = 
, tan ? = 
; find sin ?
A. 
B. 
C. 
D. 
Decide whether or not the equation defines y as a function of x.y = 2x2 + 2x - 1
A. Yes B. No
Factor the trinomial completely, or state that the trinomial is prime.24x2 - 104x - 80
A. 8(3x - 2)(x + 5) B. prime C. 8(3x + 2)(x - 5) D. (24x + 16)(x - 5)