已知:∠A是锐角,且sinA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000629853067931/SYS201311030006298530679019_ST/0.png)
,求tan
2A+cot
2A的值
考点分析:
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已知a=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000629853067931/SYS201311030006298530679018_ST/0.png)
-2,b=2+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000629853067931/SYS201311030006298530679018_ST/1.png)
,求a
2b-ab
2的值.
查看答案
(1)计算:2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000629853067931/SYS201311030006298530679017_ST/0.png)
-3
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000629853067931/SYS201311030006298530679017_ST/1.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000629853067931/SYS201311030006298530679017_ST/2.png)
;
(2)计算:2sin60°-cot30°+tan45°.
(3)解方程:x
2-6x+1=0.
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正方形OABC在坐标系中的位置如图所示,将正方形OABC绕O点顺时针旋转90°后,B点的坐标为
.
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已知,如图,在Rt△ABC中,∠BAC=90°,AD⊥BC,AC=2,BD=3,则AB
2+AC
2+AD
2=
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两地实际距离是500 m,画在图上的距离是25 cm,若在此图上量得A、B两地相距为40 cm,则A、B两地的实际距离是
m.
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