Complete the identity.
= ?
A. 1
B. -sec2 ?
C. 0
D. 1 - sin ?
Answer: A
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Provide an appropriate response.True or False? If you deposit $1,000 in an in investment account today, it can double in value to 
in just a couple decades even at a relatively low interest rate (4%).
A. True B. False
Use the Half-angle Formulas to find the exact value of the trigonometric function. sin 22.5°
A. - 
B. 
C. 
D. - 
Find the exact value of the expression.sin 
A. 
(
- 1)
B. - 
C. -
(
- 1)
D. 
The concept of childhood as a separate developmental period did not exist during which of the following centuries?
A. sixteenth B. seventeenth C. nineteenth D. twentieth