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已知函数\(g\left ( {x} \right )=\cos {\left ( {6x+\frac {π} {3}} \right )}\)的图象是由\(f\left ( {x} \right )\)的图象向左平移\(\frac {\pi } {6}\)个单位，再将横坐标变为原来的\(\frac {1} {3}\)倍（纵坐标不变）得到的，则\(f\left ( {x} \right )\)的函数解析式是___．
参考答案：\(y=\cos {2x}\)
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