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化简 \(\frac {1+\cos {x-\sin {x}}} {1-\sin {x-\cos {x}}}+\frac {1-\cos {x-\sin {x}}} {1-\sin {x+\cos {x}}}=\)___．
参考答案：\(-\frac {2} {\sin {x}}\)且\(x\ne 2k\pi +\frac {\pi } {2}(k\in Z)\)
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