The RMS value of the voltage u(t) = 3 + 4 cos (3t) is

1
\(\sqrt {17} \;V\)
2
5 V
3
7 V
4
\(\left( {3 + 2\sqrt 2 } \right)V\)
5
\(\sqrt {7} \;V\)
5
Question Not Attempted

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