第四章单元测试
- If α is the third quadrant angle, the quadrant of α/2 is （ ）.
- Assuming that sinθcosθ>0, then θ is in （ ）.
- sin(
)cos(
)tan(-
)=（ ） - If sinα>sinβ, then, in the following statements, （ ） is true.
- If sinx+cosx=1/5 (
), then tanx=（ ） - The graph of function f(x)=4sin(2x+
/3) is symmetric about the line x=- 
（ ） - The graph of function f(x)=4sin(2x+
/3) is symmetric about the node (-
, 0).（ ） - Let A={α|α=2k
2
/3, k
}, B={β|β=4k
2
/3, k
}, C={γ|γ=k
2
/3, k
}. Then 
. （ ） - In (0, 2
), if sinx>cosx, then x is in (
/4, 
). （ ） - Move all vertices on the curve of the function y=sinx (x∈R) parallel to the left by
/3, and then shorten the horizontal coordinates of all vertices on the resulting curve to 1/2 of the original (the vertical coordinate is unchanged). Then we obtain the function y=sin(2x+
/3), （ ）
A:First or second quadrant B:Second or third quadrant C:First or third quadrant D:Second or fourth quadrant
答案:Second or fourth quadrant
A:First and fourth quadrants B:Second and fourth quadrants C:First and second quadrants D:First and third quadrants
A:
B:
C:
D:
A:Assuming that α and β are the fourth quadrant angles, then tanα>tanβ B:Assuming that α and β are the third quadrant angles, then cosα>cosβ C:Assuming that α and β are the first quadrant angles, then cosα>cosβ. D:Assuming that α and β are the second quadrant angles, then tanα>tanβ
A:4/3 B:-4/3 C:3/4 D:-3/4
A:错 B:对
A:错 B:对
A:对 B:错
A:错 B:对
A:错 B:对
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