题目
题型:解答题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053728-44533.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053729-56168.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053729-11927.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053729-76569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053729-98397.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053730-25248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053730-73347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053730-16684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053730-86244.png)
答案
解:(1)由
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053730-35921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053731-73305.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053731-68685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053731-45968.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053731-82270.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053731-94157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053732-60649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053732-40449.png)
(2)由
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053732-44218.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053732-64613.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053733-28064.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053733-47087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053733-42095.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053733-18155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053734-45072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053734-91236.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053734-96116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053734-77839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053735-43186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053735-31743.png)
解析
核心考点
试题【. (本题满分12分)已知函数.(1)若,求的值;(2)设三内角所对边分别为且,求在上的值域.】;主要考察你对正弦函数的图象与性质等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053717-77648.png)
A.y="sinx" | B.y="|sinx|" | C.y="cosx" | D.y=tanx |
①正切函数是周期函数,最小正周期是π
②正切函数是奇函数
③正切函数的值域是实数集R,在定义域内无最大值和最小值
④正切函数在开区间(
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053712-59521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053712-62598.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053713-54857.png)
个定义域内是增函数;正切函数不会在某一个区间内是减函数。
⑤与正切曲线不相交的直线是
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053713-92010.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053713-54857.png)
⑥正切曲线是中心对称图形,其对称中心坐标是
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053713-10819.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053713-54857.png)
以上论断中正确的有( )
A.3个 | B.4个 | C.5个 | D.6个 |
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053705-70006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053705-96836.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053657-60097.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053657-99495.png)
(Ⅰ)求f(0);
(Ⅱ)求f(x)的解析式;
(Ⅲ)已知
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053658-94054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053641-43085.png)
(Ⅰ)当
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053641-92559.png)
(Ⅱ)若f(x)在
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053641-85675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190911/20190911053641-73639.png)
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