Solve.
- 
= 
A. 
B. 
C. 
D. 1
Answer: A
Mathematics
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Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Mathematics
Find a symbolic representation for f-1(x).f(x) = (x + 6)2
A. f-1(x) = 
B. f-1(x) = 
C. f-1(x) = 
- 6
D. Not a one-to-one function
Mathematics
Evaluate the determinant.
A. 54 B. 44 C. -54 D. -34
Mathematics
Write a word name for the number in the sentence.One gallon is equal to 3.7853 liters.
A. Thirty seven thousand and eight hundred fifty-three ten-thousandths B. Thirty seven thousand and eight hundred fifty-three hundredths C. Three and seven thousand eight hundred fifty-three thousandths D. Three and seven thousand eight hundred fifty-three ten-thousandths
Mathematics