Use a double-angle identity to find the exact value of the expression.2 cos2 22.5° - 1
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Decide if the statement is true or false.-19 > -5
A. True B. False
Mathematics
Divide.
A. 0.00007428 B. 0.0007428 C. 0.07428 D. 7.428
Mathematics
Simplify.
A. 
B. 
C. 
D. 
Mathematics
Express the sum using summation notation. Use 1 as the lower limit of summation and i for the index of summation.32 + 63 + 94 + . . . + 249
A. 
B. 
C. 
D. 
Mathematics