已知sin
=-
,则
=________ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
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20-21高一上·全国·课后作业 查看更多[1]
(已下线)5.5.1 两角和与差的正弦、余弦和正切公式(第2课时)(练习)-2020-2021学年上学期高一数学同步精品课堂(新教材人教版必修第一册)
更新时间:2021-04-17 22:22:13
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