Mathematics Trigonometry Trigonometric Functions

The maximum value of \(3 \cos \theta + 5 \sin \left( \theta - \dfrac { \pi } { 6 } \right)\) for any real value of \(\theta\) is :

1
\(\sqrt { 19 }\)
2
\(\dfrac { \sqrt { 79 } } { 2 }\)
3
\(\sqrt { 31 }\)
4
\(\sqrt { 34 }\)

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