下列4个命题中正确命题的个数是
(1)第一象限角是锐角
(2)角α终边经过点(a,a)(a≠0)时,sinα+cosα=![](https://img.xkw.com/dksih/QBM/2016/2/25/1572499386867712/1572499392872448/STEM/a4e6a3333dd24dffac44f70cee51ff94.png)
(3)若y=
sin(ωx)的最小正周期为4π,则ω=![](https://img.xkw.com/dksih/QBM/2016/2/25/1572499386867712/1572499392872448/STEM/eb027c05cae7400a82603729b9d16da3.png)
(4)若cos(α+β)=﹣1,则sin(2α+β)+sinβ=0.
(1)第一象限角是锐角
(2)角α终边经过点(a,a)(a≠0)时,sinα+cosα=
![](https://img.xkw.com/dksih/QBM/2016/2/25/1572499386867712/1572499392872448/STEM/a4e6a3333dd24dffac44f70cee51ff94.png)
(3)若y=
![](https://img.xkw.com/dksih/QBM/2016/2/25/1572499386867712/1572499392872448/STEM/eb027c05cae7400a82603729b9d16da3.png)
![](https://img.xkw.com/dksih/QBM/2016/2/25/1572499386867712/1572499392872448/STEM/eb027c05cae7400a82603729b9d16da3.png)
(4)若cos(α+β)=﹣1,则sin(2α+β)+sinβ=0.
A.0个 | B.1个 | C.2个 | D.3个 |
更新时间:2016-12-04 02:41:06
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【推荐1】下列命题中是真命题的为
A.“存在![]() ![]() |
B.在![]() ![]() ![]() |
C.任意![]() |
D.存在![]() ![]() |
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【推荐2】若
且
,则下列四个不等式:①
,②
,③
,④
中,一定成立的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/773ca22fc12ade9e60dbc749ba5cfa73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d6032f58b372659a3271b7f6c4397a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6543e0a1fa9c75226b57897f04870a79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd325feea1c42d60e7d23beb534288e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dbe26f00de61e3f6db9c5fa70abab59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2128a00f52af4427721f0ebba591daa.png)
A.①② | B.③④ | C.②③ | D.①②③④ |
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