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已知\(\cos {α=\frac {1} {7}}，\sin {\left ( {α+β} \right )}=\frac {5\sqrt {13}} {14}，0<α<\frac {\pi } {2}，0<β<\frac {\pi } {2}\)，则角\(β=\) ___．
参考答案：\(\frac {\pi } {3}\)
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