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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Solve.Find the area of an ellipse with a major axis 14 and a minor axis 6.
A. 42? B. 21? C. 42 D. 10.5?
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Express the product as a sum containing only sines or cosines.-2 sin(5?) sin ?
A. cos(6?) - cos(4?) B. cos(6?) + cos(4?) C. cos(7?) - cos(3?) D. cos(7?) + cos(3?)
Mathematics
Solve the problem.A garden is constructed in the shape of a trapezoid. If the parallel sides are 5 feet apart and measure 6 feet and 12 feet, find the area of the garden.
A. 36 ft2 B. 90 ft2 C. 45 ft2 D. 23 ft2
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Identify the greatest common factor.2x2y - 10xy2
A. 2xy B. 2 C. 2x2y2 D. xy
Mathematics