Solve the problem.If a tone is formed from the combination of two component frequencies, F1 and F2 , as is done with touch-tone phones, then the tone can be represented as  if the intensities of the components are equal. For the two component frequencies  and  rewrite this expression as a product of trigonometric functions and graph the result in -4.0px;" /> by 



A. 2 cos(995?t) cos(995?t)
[0, .005, .001] by [-2, 2, 1]

B. 2 cos(995?t) cos(265?t)
[0, .005, .001] by [-2, 2, 1]

C. 2 cos(1990?t) cos(1990?t)
[0, .005, .001] by [-2, 2, 1]

D. 2 cos(1990?t) cos(530?t)
[0, .005, .001] by [-2, 2, 1]


Answer: D

Mathematics

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