Rewrite the expression as an equivalent expression that does not contain powers of trigonometric functions greater than 1.f(x) = cos3 x
A. 
cos x + 
cos 3x
B. 
cos x - 
cos 3x
C. 
cos x + 
cos 3x + cos 2x
D. 
cos x - 
cos 3x - cos 2x
Answer: A
Mathematics
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A. No B. Yes
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A. 
B. 
C. 
D. 
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Estimate the value of the quantity.A swimming pool has a leak. The leak is getting worse. The following table gives the leakage rate every 6 hours.
Give the upper estimate for the number of gallons lost.
A. 33.2 gallons B. 259.2 gallons C. 145.2 gallons D. 199.2 gallons
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