Find the product, if possible. 
A. 
B. 
C. 
D. 
Answer: D
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Write the sum or difference as a product containing only sines and/or cosines.sin(6?) - sin(4?)
A. 2 sin(5?) cos ? B. -2 sin ? cos(5?) C. -2 sin(5?) cos ? D. 2 sin ? cos(5?)
Solve the problem.The loudness of a sound is measured in decibels (dB). The loudness L of a sound is related to its intensity I by the equation 
where I0 = 10-12 watts per square meter (W/m2) is the intensity of the faintest sound the human ear can detect. Find the intensity of a 72 dB sound.
A. I = 1019.2 W/m2 B. I = -4.810 W/m2 C. I = 10-4.8 W/m2 D. I = 10708 W/m2
Find the derivative of the function at the given value of x using a graphing utility. If necessary, round to four decimal places.f(x) = x sin(8x); x = 9
A. -69.6336 B. 2284.3294 C. -69.3875 D. -2284.3294
Solve the inequality. Write the solution in interval notation.
< 0
A. (-?, -2) B. (-?, -2) ? (6, ?) C. (-2, 6) D. (6, ?)