Express the product as a sum containing only sines or cosines.cos (5?) cos (4?)

A. [cos (9?) - cos ?]
B. [ cos ? + cos (9?)]
C. [cos (9?) - sin ?]
D. cos2 (20?2)

Answer: B

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Evaluate or simplify the following the expression.91/2

A. 6
B.
C. 12
D. 3

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Solve the equation using the addition principle. + x = 4

A.  
B.  
C.
D. 19

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Graph the inequality.x > -4 

A.
 
B.  
 
C.
 
D.
  

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Complete the identity.cos ? - cos ? sin2 ? = ?

A. sin ? B. cos3 ? C. sec2 ? D. tan2 ?

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