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x(t) =

cos(2*pi*f1*t) 0 <= t < 4

cos(2*pi*f2*t) 4 <= t < 8

cos(2*pi*f3*t) 8 <= t < 12

f1, f2, and f3 are given as well

Would it be possible to combine all three of these conditions into one convenient equation or am I just dreaming? I tried using Matlab to concatenate the three graphs, but it won't give me an equation of it.

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# Combining periodic function

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