The signal \(x\left( t \right) = 3\cos \left( {5t + \frac{\pi }{6}} \right),\) is a periodic signal with a period of:

The signal \(x\left( t \right) = 3\cos \left( {5t + \frac{\pi }{6}} \r

1.	The signal \(x\left( t \right) = 3\cos \left( {5t + \frac{\pi }{6}} \right),\) is a periodic signal with a period of:
A.	\(\frac{{2\pi }}{3}\)
B.	\(\frac{{\pi }}{5}\)
C.	\(\frac{{2\pi }}{5}\)
D.	\(\frac{{2\pi }}{7}\)
Answer» D. \(\frac{{2\pi }}{7}\)