Simplify the expression.2 cos2 4x - 1
A. cos 4x
B. 2 sin 4x
C. cos 8x
D. 
sin 16x
Answer: C
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Solve the problem.A swimming pool has a rectangular base 12 ft long and 24 ft wide. The sides are 5 ft high, and the pool is half full of water. How much work will it take to empty the pool by pumping the water out over the top of the pool? Assume that the water weighs 62.4 lb/ft3. Give your answer to the nearest ft ? lb.
A. 168,480 ft ? lb B. 224,640 ft ? lb C. 84,240 ft ? lb D. 112,320 ft ? lb
Use a graphing calculator to perform the indicated multiplication.
A. 
B. 
C. 
D. 
Solve the problem.A sanding machine disk can be described as the volume generated by rotating the area bounded by 
and the y-axis about the y-axis (measurements in in.). Locate the centroid of the disk to the nearest 0.001.
A. 0.507 in. above the center of the larger surface B. 0.247 in. above the center of the larger surface C. 0.493 in. above the center of the larger surface D. 0.986 in. above the center of the larger surface
Find a positive angle less than 360° or 2? that is coterminal with the given angle.-1169°
A. 271° B. 809° C. 91° D. 89°