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已知\(\sin {\left ( {\frac {π} {3}+α} \right )}=\frac {4} {5}\)，\(\frac {π} {6}<α<\frac {5\pi } {6}\)，则\(\cos {α=}\)___．
参考答案：\(\frac {4\sqrt {3}-3} {10}\)
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