(1)已知
,
,且
,求
的值;
(2)在
中,三内角
,
,
满足:
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee6b1670b2b446ace5bc12d7385b8e78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e06864c79a4a289cb3d17f9f34c1ee76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed53925cace8212e87a4d3bad6463718.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdd813767c3263437ee6e96a1ab75bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/837fa04d9af213e212801721b4d0d761.png)
更新时间:2023-12-20 13:51:05
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解答题-问答题
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适中
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解题方法
【推荐1】(1)已知角
的终边上有一点
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(2)已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d658b3385c5aa6be7e66f636648af14b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4fd6d536712fa3212068131c14e2df4.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaec4b86f6b9f3dadfe9cb40bbcabcbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d521f8d021b20757d7a68107fcef1d.png)
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适中
(0.65)
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【推荐2】用几种不同的乐器同时弹奏某一首乐曲时,我们有时能听到比用单一乐器弹奏时更美妙的声音,这实际上是几种声波合成后改变了单一声波的波形.假设某美妙声波的传播曲线可用函数
来描述,求该声波函数的周期、最大值和最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b28a627b8b7498fb2256b37f7bc36a.png)
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解答题-证明题
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【推荐1】已知
、
是锐角,
,且满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cc86a1947dbe844beb529e014309f71.png)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e26cc5ead2a5b2df0b9f2b1d7ac99c0.png)
(2)求
的最大值,并求取得最大值时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daec8faf382b031a3f5916774651cf02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cc86a1947dbe844beb529e014309f71.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e26cc5ead2a5b2df0b9f2b1d7ac99c0.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f35152720e43c6403d43bef47c0377d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
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【推荐2】已知
为
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,
且
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd623487dd05102b6849bff02e54770c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/065f2d56206cfe3e9568a2a2df86d4bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c873160e6e998c3c76c671bc4aef27b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ca8309b6b4a914248aa4b8387b1f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f316be654a855ff76b811df4528c6552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f0a6ee7f47d6b7d6207d110fd179266.png)
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