单选题 较易0.85 引用1 组卷199
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 |
15-16高一上·黑龙江双鸭山·期末
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下列四个命题中,正确的是
A.若x>1,则∀y⋲(-∞,1),xy≠1 |
B.若x=sinθcosθ,则∀θ⋲(0, |
C.若x>1,则彐y⋲(-∞,1),xy=1 |
D.若x=sinθcosθ,则彐θ⋲(0, |
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