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