Check the periodicity of x(t)= 3cos√2+7 cos 5πt
ω=5π=2π/T→T=2/5=0.4 (s)\omega=5\pi=2\pi/T\to T=2/5=0.4\ (s)ω=5π=2π/T→T=2/5=0.4 (s) . Answer
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