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若 \(f(\alpha )=\frac {\sin {(}-\alpha -\frac {3\pi } {2})\cos {(}\frac {3\pi } {2}-\alpha )ta{{n}^{2}}(\pi -\alpha )} {\cos {(}\frac {\pi } {2}+\alpha )\sin {(}\pi +\alpha )}\) ，则 \(f(\frac {\pi } {4})=\) ___．
参考答案：\( - 1\)
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