Use the Half-angle Formulas to find the exact value of the trigonometric function. cos 22.5°
A. - 
B. 
C. - 
D. 
Answer: D
Mathematics
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Find the distance between two points.(2, 2) and (8, 10)
A. 10 B. 15 C. 13 D. 7 E. 16
Mathematics
Provide an appropriate response.Tell whether or not the number is given in scientific notation.7.451 × 109
A. No B. Yes
Mathematics
Write the product as a sum or difference containing only sines or cosines.cos(6?) cos(5?)
A. cos2(30?2)
B. 
[cos(11?) - sin ?]
C. 
[ cos ? + cos(11?)]
D. 
[cos(11?) - cos ?]
Mathematics
Write the expression in lowest terms.
A. 
B. 
C. 
D. 
Mathematics