满分5 >
高中数学试题 >
=( ) A.-2sin5° B.2sin5° C.-2cos5° D.2cos...
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233005_ST/0.png)
=( )
A.-2sin5°
B.2sin5°
C.-2cos5°
D.2cos5°
考点分析:
相关试题推荐
若a,b是两个互相垂直的非零向量,则在以下给出的式子“①
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233004_ST/0.png)
=0;②
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233004_ST/1.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233004_ST/2.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233004_ST/3.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233004_ST/4.png)
;③|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233004_ST/5.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233004_ST/6.png)
|=|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233004_ST/7.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233004_ST/8.png)
|;④
2+
2=(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233004_ST/11.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233004_ST/12.png)
)
2;⑤(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233004_ST/13.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233004_ST/14.png)
)•(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233004_ST/15.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233004_ST/16.png)
)=0”中正确的有( )
A.1个
B.2个
C.3个
D.4个
查看答案
下列四个函数中,既是(0,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233003_ST/0.png)
)上的增函数,又是以π为周期的偶函数是( )
A.y=cos2
B.y=|sin2x|
C.y=|cosx|
D.y=|sinx|
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233002_ST/images0.png)
如图,D,E,F分别是△ABC的边AB,BC,CA的中点,则( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233002_ST/0.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233002_ST/1.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233002_ST/2.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233002_ST/3.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233002_ST/4.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233002_ST/5.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233002_ST/6.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233002_ST/7.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233002_ST/8.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233002_ST/9.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233002_ST/10.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233002_ST/11.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233002_ST/12.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233002_ST/13.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233002_ST/14.png)
=
查看答案
sin10°cos20°+sin80°sin160°=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233001_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233001_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230927970823386/SYS201311012309279708233001_ST/2.png)
D.
查看答案