利用积化和差公式化简sinαsin($\frac{\mathrm{\pi }}{2}$-β)的结果为（　　）

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                                                                                                       春兴（唐）武元衡
                                                                                                杨柳阴阴细雨晴，残花落尽见流莺。
                                                                                                春风一夜吹乡梦，又逐春风到洛城。