如图,设单位圆与
轴的正半轴相交于点
,当
时,以
轴非负半轴为始边作角
,
,它们的终边分别与单位圆相交于点
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/50d32c68-e2d7-4917-bbdf-2d464ef0d5e2.png?resizew=187)
(1)叙述并利用上图证明两角差的余弦公式;
(2)利用两角差的余弦公式与诱导公式.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/451fc6e4248b63e70595f23842f06c93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7edb92386f14c138eb7ffaf23ac9f34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](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/824252476627836b28c2604ee0ba4f5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b182855fac592196067cf654ee67f84e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/50d32c68-e2d7-4917-bbdf-2d464ef0d5e2.png?resizew=187)
(1)叙述并利用上图证明两角差的余弦公式;
(2)利用两角差的余弦公式与诱导公式.证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3adf14c530b8090dd2935ff469f829.png)
更新时间:2021-07-21 08:35:26
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(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a1e5ea115bbe124eea33b07df2d1e3a.png)
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