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OpenStudy (anonymous):
What is the period of x(t)=6cos((2*pi*t )/7)+2cos((4pi*t)/7)
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OpenStudy (anonymous):
Why is it 7?
OpenStudy (tkhunny):
\(\dfrac{2\pi}{\dfrac{2\pi}{7}} = 7\) \(\dfrac{2\pi}{\dfrac{4\pi}{7}} = 7/2\) Which is longer?
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