已知cos2θ=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124117571505275/SYS201310251241175715052012_ST/0.png)
,则sin
4θ+cos
4θ=
.
考点分析:
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已知以T=4为周期的函数
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,其中m>0,若方程3f(x)=x恰有5个实数解,则m的取值范围为( )
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A.
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D.2
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点P到点
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A.
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B.
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C.
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D.
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D.
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