Solve the problem.The sound produced by touching each button on a touch-tone phone is described by y = sin 2?lt + sin 2?htwhere l and h are the low and high frequencies (cycles per second) in the figure shown.
Describe the sound emitted by touching the 3 key as a product of sines and cosines.
A. y = 2 sin(512?t) cos(1906?t)
B. y = 2 sin(2174?t) cos(780?t)
C. y = 2 sin(1906?t) cos(512?t)
D. y = 2 sin(780?t) cos(2174?t)
Answer: B
Mathematics
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