Find the exact value of the expression using a sum, difference, or double-angle identity.2 sin  cos 

A. - 
B. - 
C.
D.

Answer: C

Mathematics

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Perform the indicated operation and, if possible, simplify. ? 

A.  
B.  
C.  
D.

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Mathematics

Find the sum.

A.
B.
C.
D. Does not exist

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Mathematics

Write the first four terms of the sequence.an = (-1)n+9

A. a1 = -1, a2 = 1, a3 = -1, a4 = 1 B. a1 = -1,a2 = -1, a3 = -1, a4 = -1 C. a1 = 1, a2 = 1, a3 = 1, a4 = 1 D. a1 = 1, a2 = -1, a3 = 1, a4 = -1

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Mathematics

Evaluate.-  ÷ 

A. - 
B.  
C.  
D. -  

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Mathematics