Find the exact value of the expression.cos 20° cos 40° - sin 20° sin 40°
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Using a calculator, evaluate the expression. Round the answer to four decimal places.cos(cos-1(-0.9372))
A. 0.9372 B. 0.4686 C. -0.4686 D. -0.9372
Mathematics
For the given function, find the requested relative extrema or extreme value.y = 6ex + xex; relative extrema
A. (7, 13e7), relative maximum B. (6, 12e6), relative maximum C. (-6, 0), relative minimum D. (-7, -e-7), relative minimum
Mathematics
Simplify.
A. 
B. 
C. 
D. 
Mathematics
Solve the formula for the indicated variable.S = 2?rh + 2?r2, for h
A. h = S - r
B. h = 
C. h = 2?(S - r)
D. h = 
- 1
Mathematics