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The sound produced by touching each button on a touch-tone phone is described by y = sin 2πlt + sin 2πht where l and h are the low and high frequencies (cycles per seconD. in the figure shown.

Use a calculator to find the graph of the sound emitted by touching the 4 key in a [0, 0.01, 0.001] by [-2, 2, 1] viewing rectangle.

The sound produced by touching each button on a touchtone phone is described by y sin 2πlt sin 2πht where l and h are the low and high frequencies cycles per se class=
The sound produced by touching each button on a touchtone phone is described by y sin 2πlt sin 2πht where l and h are the low and high frequencies cycles per se class=

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AL2006
Your graph is attached.

It kinda looks to me like ' D ' is the choice,
but I'm pretty tired, so you oughta check it.
Ver imagen AL2006

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