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 0 key as a product of sines and cosines.

A. y = 2 sin(395?t) cos(2277?t)
B. y = 2 sin(536?t) cos(2418?t)
C. y = 2 sin(2418?t) cos(536?t)
D. y = 2 sin(2277?t) cos(395?t)


Answer: D

Mathematics

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Perform the indicated operation and express in lowest terms.  -  

A. 5x - 5y
B.
C.
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Mathematics