Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Find the sum of the series.
A. 
B. 1
C. 
D. 3
Mathematics
Simplify the following expression.
?
?
A. 1
B. x6y?4
C. 
D. 4
E. 
Mathematics
Solve the problem.Consider the region R bounded by the graph of f(x) = 
on the interval [0, 5]. Find the volume of the solid formed when R is revolved about the x-axis.
A. 
B. 
C. 
+ 40
D. 
Mathematics
Evaluate the expression to determine the entry missing from the table.
A. 2 ? -5 ? 3 is -30 B. 2 ? -5 ? -5 is -30 C. 3 ? -5 ? 3 is -45 D. 3 ? -5 ? 3 is -30
Mathematics