Make up a table with columns headed by values of kx running from x = -λ/2 to x = +λ in intervals of x of λ/4—of course, k = 2п/λ. In each column place the corresponding values of cos (kx -п/4) and beneath that the values of cos (kx + 3 п/4). Next plot the functions 15 cos (kx - п/4) and 25 cos (kx + 3 п/4).
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