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已知\(f\left ( {n} \right )=\sin {\frac {n\pi } {4}}，n\in Z\)，则 \(f\left ( {1} \right )+f\left ( {2} \right )+f\left ( {3} \right )+\cdots +f\left ( {2019} \right )=\)___．
参考答案：\(1 + \sqrt 2 \)
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